function ImageExpander(oThumb, sImgSrc)
{
this.oThumb = oThumb;
this.oThumb.expander = this;
this.oThumb.onclick = function() { this.expander.expand(); }
this.smallWidth = oThumb.offsetWidth;
this.smallHeight = oThumb.offsetHeight;
this.bExpand = true;
this.bTicks = false;
if ( !window.aImageExpanders )
{
window.aImageExpanders = new Array();
}
window.aImageExpanders.push(this);
this.oImg = new Image();
this.oImg.expander = this;
this.oImg.onload = function(){this.expander.onload();}
this.oImg.src = sImgSrc;
}
ImageExpander.prototype.onload = function()
{
this.oDiv = document.createElement("div");
document.body.appendChild(this.oDiv);
this.oDiv.appendChild(this.oImg);
this.oDiv.style.position = "absolute";
this.oDiv.expander = this;
this.oDiv.onclick = function() {this.expander.toggle();};
this.oImg.title = "Click to reduce.";
this.bigWidth = this.oImg.width;
this.bigHeight = this.oImg.height;
if ( this.bExpand )
{
this.expand();
}
else
{
this.oDiv.style.visibility = "hidden";
this.oImg.style.visibility = "hidden";
}
}
ImageExpander.prototype.toggle = function()
{
this.bExpand = !this.bExpand;
if ( this.bExpand )
{
for ( var i in window.aImageExpanders )
if ( window.aImageExpanders[i] !== this )
window.aImageExpanders[i].reduce();
}
}
ImageExpander.prototype.expand = function()
{
this.bExpand = true;
for ( var i in window.aImageExpanders )
if ( window.aImageExpanders[i] !== this )
window.aImageExpanders[i].reduce();
if ( !this.oDiv ) return;
this.oThumb.style.visibility = "hidden";
this.x = this.oThumb.offsetLeft;
this.y = this.oThumb.offsetTop;
this.w = this.oThumb.clientWidth;
this.h = this.oThumb.clientHeight;
this.oDiv.style.left = this.x + "px";
this.oDiv.style.top = this.y + "px";
this.oImg.style.width = this.w + "px";
this.oImg.style.height = this.h + "px";
this.oDiv.style.visibility = "visible";
this.oImg.style.visibility = "visible";
if ( !this.bTicks )
{
this.bTicks = true;
var pThis = this;
window.setTimeout(function(){pThis.tick();},1);
}
}
ImageExpander.prototype.reduce = function()
{
this.bExpand = false;
}
ImageExpander.prototype.tick = function()
{
var cw = document.body.clientWidth;
var ch = document.body.clientHeight;
var cx = document.body.scrollLeft + cw / 2;
var cy = document.body.scrollTop + ch / 2;
var tw,th,tx,ty;
if ( this.bExpand )
{
tw = this.bigWidth;
th = this.bigHeight;
if ( tw > cw )
{
th *= cw / tw;
tw = cw;
}
if ( th > ch )
{
tw *= ch / th;
th = ch;
}
tx = cx - tw + 100;
ty = cy - th + 100;
}
else
{
tw = this.smallWidth;
th = this.smallHeight;
tx = this.oThumb.offsetLeft;
ty = this.oThumb.offsetTop;
}
var nHit = 0;
var fMove = function(n,tn)
{
var dn = tn - n;
if ( Math.abs(dn) < 3 )
{
nHit++;
return tn;
}
else
{
return n + dn / 10;
}
}
this.x = fMove(this.x, tx);
this.y = fMove(this.y, ty);
this.w = fMove(this.w, tw);
this.h = fMove(this.h, th);
this.oDiv.style.left = this.x + "px";
this.oDiv.style.top = this.y + "px";
this.oImg.style.width = this.w + "px";
this.oImg.style.height = this.h + "px";
if ( !this.bExpand && (nHit == 4) )
{
this.oImg.style.visibility = "hidden";
this.oDiv.style.visibility = "hidden";
this.oThumb.style.visibility = "visible";
this.bTicks = false;
}
if ( this.bTicks )
{
var pThis = this;
window.setTimeout(function(){pThis.tick();},1);
}
}
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