var re_try_time = 1000;
var main_tout = null; // main timeout id

function getElement(aID){
	if (document.getElementById) return document.getElementById(aID);
	else return document.all[aID];
}

function render(layer) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) {  // html code has been read ...
		if (NS) document[layer].display = "block";
		else if (IE) document.all[layer].style.display = "block";
		else if (MOZILLA) data = document.getElementById(layer).style.display = "block";
	}
	else setTimeout("show("+layer+")", re_try_time);
}

function unrender(layer) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) {  // html code has been read ...
		if (NS) document[layer].display = "none";
		else if (IE) document.all[layer].style.display = "none";
		else if (MOZILLA) data = document.getElementById(layer).style.display = "none";
	}
	else setTimeout("show("+layer+")", re_try_time);
}

function show(layer) {
	if (e=getElement(layer)) {  // html code has been read ...
		if (NS) document[layer].visibility = "show";
		else {
			e.style.visibility = "visible";
		}
	}
	else setTimeout("show("+layer+")", re_try_time);
}

function hide(layer) {
	if (e=getElement(layer)) {  // html code has been read ...
		if (NS) document[layer].visibility = "hide";
		else e.style.visibility = "hidden";
	}
	else setTimeout("show("+layer+")", re_try_time);
}

function moveBy(layer, x, y) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) {
			document[layer].left = document[layer].left+x;
			document[layer].top  = document[layer].top+y;
		}
		else if (IE){
			document.all[layer].style.pixelLeft = document.all[layer].style.pixelLeft+x;
			document.all[layer].style.pixelTop  = document.all[layer].style.pixelTop+y;
		}
		else {
			document.getElementById(layer).style.left = (parseInt(document.getElementById(layer).style.left) + x) + "px";
			document.getElementById(layer).style.top  = (parseInt(document.getElementById(layer).style.top) + y) + "px";
		}
	}
	else setTimeout("moveBy("+layer+","+x+","+y+")", re_try_time);
}


function moveTo(layer, x, y) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) {
			document[layer].left = x;
			document[layer].top  = y;
		}
		else if (IE){
			document.all[layer].style.pixelLeft = x;
			document.all[layer].style.pixelTop  = y;
		}
		else {
			document.getElementById(layer).style.left = x + "px";
			document.getElementById(layer).style.top  = y + "px";
		}
	}
  	else setTimeout("move("+layer+","+x+","+y+")", re_try_time);
}

function getLeft(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) data = document[layer].left;
		else if (IE) data = document.all[layer].style.pixelLeft;
		else data = document.getElementById(layer).style.left;
	}
	else setTimeout("getLeft("+layer+")", re_try_time);
	return data;
}


function getTop(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) data = document[layer].top;
		else if (IE) data = document.all[layer].style.pixelTop;
		else data = document.getElementById(layer).style.top;
	}
	else setTimeout("getTop("+layer+")", re_try_time);
	return data;
}

function getHeight(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (IE) data = document.all[layer].clientHeight
		else if (NS) data = document.layers[layer].document.height;
		else data = parseInt(document.getElementById(layer).offsetHeight)
	}
	else setTimeout("getHeight("+layer+")", re_try_time);
	return data;
}


function getWidth(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (IE) data = document.all[layer].clientWidth
		else if (NS) document.layers[layer].document.width;
		else data = parseInt(document.getElementById(layer).offsetWidth)
	}
	else setTimeout("getWidth("+layer+")", re_try_time);
	return data;
}


function resizeBy(layer, x, y) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) { // ?
			document[layer].document.width = document[layer].document.width+x;
			document[layer].document.height  = document[layer].document.height+y;
		}
		else {      // ok
			document.all[layer].style.width = parseInt(document.all[layer].style.width)+x;
			document.all[layer].style.height  = parseInt(document.all[layer].style.height)+y;
		}
	}
	else setTimeout("resizeBy("+layer+","+x+","+y+")", re_try_time);
}

function resizeTo(layer, x, y) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) { // ?
			document[layer].document.width = x;
			document[layer].document.height  = y;
		}
		else {      // ok
			document.all[layer].style.width = x;
			document.all[layer].style.height  = y;
		}
	}
	else setTimeout("resizeTo("+layer+","+x+","+y+")", re_try_time);
}

function getClipX0(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) data = document[layer].clip.left;
		else if (IE) data = document.all[layer].style.clip.match(/\d+/g)[3];
		else data = document.getElementById(layer).style.clip.match(/\d+/g)[3]
	}
	else setTimeout("getClipX0("+layer+")", re_try_time);
	return parseInt(data);
}

function getClipY0(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
   		if (NS) data = document[layer].clip.top;
   		else if (IE) data = document.all[layer].style.clip.match(/\d+/g)[0];
   		else data = document.getElementById(layer).style.clip.match(/\d+/g)[0];
  	}
	else setTimeout("getClipY0("+layer+")", re_try_time);
	return parseInt(data);
}

function getClipX1(layer) {
	var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) data = document[layer].clip.right;
		else if (IE) data = document.all[layer].style.clip.match(/\d+/g)[1];
		else data = document.getElementById(layer).style.clip.match(/\d+/g)[1];
	}
	else setTimeout("getClipX1("+layer+")", re_try_time);
	return parseInt(data);
}

function getClipY1(layer) {
  var data=0;
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) data = document[layer].clip.bottom;
		else if (IE) data = document.all[layer].style.clip.match(/\d+/g)[2];
		else data = document.getElementById(layer).style.clip.match(/\d+/g)[2];
	}
	else setTimeout("getClipY1("+layer+")", re_try_time);
	return parseInt(data);
}

function setClip(layer, x0, y0, x1, y1) {

	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		if (NS) {
			document[layer].clip.left   = x0;
			document[layer].clip.top    = y0;
			document[layer].clip.right  = x1;
			document[layer].clip.bottom = y1;
		}
		else if (IE){
			document.all[layer].style.clip="Rect("+y0+"px "+x1+"px "+y1+"px "+x0+"px)"
		}
		else {
			document.getElementById(layer).style.clip="Rect("+y0+"px, "+x1+"px, "+y1+"px, "+x0+"px)"
		}
		if (MAC && IE) {
			moveBy(layer, -1, -1); // to prevent MAC & IE sleeping !!!
			moveBy(layer, 1, 1);
		}
	}
	else setTimeout("setClip("+layer+","+x0+","+y0+","+x1+","+y1+")", re_try_time);
}


function scrollH(layer, offset) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		moveBy(layer, -offset, 0);
		setClip(layer, (getClipX0(layer)+offset), getClipY0(layer), (getClipX1(layer)+offset), getClipY1(layer));
		if (main_tout!=null) clearTimeout(main_tout);
	}
	else main_tout=setTimeout("scrollH("+layer+","+offset+")", re_try_time);
}

function scrollV(layer, offset) {
	if (NS && document[layer] || IE && document.all[layer] || MOZILLA && document.getElementById(layer)) { // html code has been read ...
		moveBy(layer, 0, -offset);
		setClip(layer, getClipX0(layer), getClipY0(layer)+offset, getClipX1(layer), getClipY1(layer)+offset);
		if (main_tout!=null) clearTimeout(main_tout);
	}
	else main_tout=setTimeout("scrollV("+layer+","+offset+")", re_try_time);
}


function setBody(layer, body) {
	if (e=getElement(layer)) {  // html code has been read ...
		if (NS) {
			document[layer].document.write(body);
			document[layer].document.close();
		}
		else {
			e.innerHTML = body;
		}
	}
	else setTimeout("setBody("+layer+","+body+")", re_try_time);
}

function setZindex(layer, index) {
;//
}

/* Scroll Object */

function Scroll(layer, delay, offset, loop) {

    this.layer = layer;
    this.loop = (loop)?true:false;

    this.x0 = getClipX0(layer);     // position and dimension...
    this.y0 = getClipY0(layer);
    this.x1 = getClipX1(layer);
    this.y1 = getClipY1(layer);
    this.X0 = getClipX0(this.layer);
    this.X1 = getClipX1(this.layer);
    this.Y0 = getClipY0(this.layer);
    this.Y1 = getClipY1(this.layer);
    this.x = getLeft(layer);
    this.y = getTop(layer);

    if (MOZILLA && document.getElementById(layer)) {
	    this.dimx = document.getElementById(layer).offsetWidth;
	    this.dimy = document.getElementById(layer).offsetHeight;
  	} else {
	    this.dimx = (IE)?document.all[layer].clientWidth:document.layers[layer].document.width;
	    this.dimy = (IE)?document.all[layer].clientHeight:document.layers[layer].document.height;
	}
    //alert(this.dimx+" "+this.dimy);

    this.delay = delay;           // scrolling parameters
    this.offset = offset;

    this.direction = null;
    this.scroll_type = null;
    this.timeout_id = null;

    this.scrolling = scrolling;   // methods
    this.start = start;
    this.stop = stop;
    this.reset = reset;
    this.needed=((this.dimy-1)>Math.abs(this.Y1-this.Y0) || (this.dimx-1)>Math.abs(this.X1-this.X0));    // this.dimx-1 : patch per IE5.1 MAC: rileva dimx con 1 pixel in +!!
    alert(this.needed)
    //alert(this.dimx+" "+Math.abs(this.X1-this.X0));
    this.name = layer + "Var"; // in questo modo posso sapere con che nome e' stato istanziato l'oggetto per poterne richiamare i metodi con setInterval o setTimeout
    eval(this.name + " = this"); //      esempio:   this.timer = setInterval(this.name + ".step()", interval);
}



function start(dir, delay) {

/* direction: 0 ^      -
              1 >      +
              2 v      +
              3 <      -
*/

 // alert(this.dimy+" "+this.Y1);
 if(this.dimy>this.Y1 || this.dimx>this.X1) {
  if(delay) this.delay=delay; // set new delay if specified
  this.direction = dir;
  this.offset = (dir==1||dir==2)?Math.abs(this.offset):-Math.abs(this.offset); // set offset sign according to direction (RIGHT, DOWN : positive; UP, LEFT : negative)
  this.scroll_type = (dir==0||dir==2)?'scrollV':'scrollH'; // set function name according to direction (UP/DOWN, LEFT/RIGHT)
  var doscroll = true;

  this.x0 = getClipX0(this.layer);
  this.x1 = getClipX1(this.layer);
  this.y0 = getClipY0(this.layer);
  this.y1 = getClipY1(this.layer);

  switch (this.direction) {
  	case 0:
  	         if (this.y0 + this.offset <= 0) doscroll=false;
                 break;
  	case 2:
  	         if (this.y1 + this.offset >= this.dimy) doscroll=false;
  	         break;
  	case 1:
  	         if (this.x1 + this.offset  >= this.dimx) doscroll=false;
  	         break;
  	case 3:
  	         if (this.x0 + this.offset  <= 0) doscroll=false;
  	         break;
  }

  if (doscroll) {
   if (this.scroll_type=='scrollV') scrollV(this.layer,this.offset); // perform the scroll!
   else scrollH(this.layer,this.offset);
   this.timeout_id=setTimeout(this.name+".scrolling()",this.delay); // scrolling!
  }
  else {
     switch (this.direction) {
  	case 0:  scrollV(this.layer, -this.y0);
                 break;

  	case 2:  scrollV(this.layer, (this.dimy-this.y1));
                 break;

  	case 1:  scrollH(this.layer, (this.dimx-this.x1));
  	         break;

  	case 3:  scrollH(this.layer, -this.x0);
  	         break;

        }
     if (this.loop) {
          moveTo(this.layer,this.x,this.y);
          setClip(this.layer, this.X0, this.Y0, this.X1, this.Y1);
          this.timeout_id=setTimeout(this.name+".scrolling()",this.delay); // scrolling!
     }

  }
 }
}

function scrolling () {
  var doscroll = true;

  this.x0 = getClipX0(this.layer);
  this.x1 = getClipX1(this.layer);
  this.y0 = getClipY0(this.layer);
  this.y1 = getClipY1(this.layer);

  switch (this.direction) {
  	case 0:
  	         if (this.y0 + this.offset <= 0) doscroll=false;
                 break;
  	case 2:
  	         if (this.y1 + this.offset >= this.dimy) doscroll=false;
  	         break;
  	case 1:
  	         if (this.x1 + this.offset  >= this.dimx) doscroll=false;
  	         break;
  	case 3:
  	         if (this.x0 + this.offset  <= 0) doscroll=false;
  	         break;
  }

  if (doscroll) {
   if (this.scroll_type=='scrollV') scrollV(this.layer,this.offset); // perform the scroll!
   else scrollH(this.layer,this.offset);
   this.timeout_id=setTimeout(this.name+".scrolling()",this.delay); // scrolling!
  }
  else {
     switch (this.direction) {
  	case 0:  scrollV(this.layer, -this.y0);
                 break;

  	case 2:  scrollV(this.layer, (this.dimy-this.y1));
                 break;

  	case 1:  scrollH(this.layer, (this.dimx-this.x1));
  	         break;

  	case 3:  scrollH(this.layer, -this.x0);
  	         break;
    }
    if (this.loop) {
     	  moveTo(this.layer,this.x,this.y);
          setClip(this.layer, this.X0, this.Y0, this.X1, this.Y1);
     	  this.timeout_id=setTimeout(this.name+".scrolling()",this.delay); // scrolling!
     }
  }

}

function stop() {
  if (this.timeout_id!=null) {
     clearTimeout(this.timeout_id);
     this.timeout_id=null;
     setTimeout("clearTimeout("+this.name+".timeout_id)", 10);
  }
}

function reset() {
   this.stop();
   moveTo(this.layer,this.x,this.y);
   setClip(this.layer, this.X0, this.Y0, this.X1, this.Y1);
}