/*	Fisheye Dock Menu
	
	Implementation instructions: http://wcms-dev.fit.edu/core/wiki/FisheyeDockMenu
	
*/
var xm = xmb = ov = 0;
var M = true;

function dock(dock, legend, sMin, sMax) {
	this.icons = document.getElementById(dock).getElementsByTagName('img');
	this.N = this.icons.length;
	this.s = sMin;
	this.ovk = 0;
	this.pxLeft = function(o) {
		for(var x=-document.documentElement.scrollLeft; o != null; o = o.offsetParent) x+=o.offsetLeft;
		return x;
	}
	for(var i=0;i<this.N;i++) {
		with(this.icons[i]) {
			style.width = sMin+"px";
			style.height = sMin+"px";
			className = "dockicon";
		}
	}
	this.run = function() {
		with(this) {
			for(var i=0;i<N;i++) {
				var o = icons[i];
				var W = parseInt(o.style.width);
				if(ov && ov.className=="dockicon") {
					if(ov!=ovk) ovk=ov;
					document.getElementById(legend).innerHTML = ov.title;
					if(M) W = Math.max((s*Math.cos(((pxLeft(o)+W/2)-xm)/sMax)),sMin);
					s = Math.min(sMax,s+1);
				} else {
					s = Math.max(s-1,sMin);
					W = Math.max(W-N,sMin);
					document.getElementById(legend).innerHTML = '';
				}
				o.style.width = W+"px";
				o.style.height = W+"px";
			}
			if(s >= sMax) M = false;
		}
	}
}
document.onmousemove = function(e) {
	if(window.event) e=window.event;
	xm = (e.x || e.clientX);
	if(xm!=xmb) {
		M = true;
		xmb = xm;
	}
	ov = (e.target)?e.target:((e.srcElement)?e.srcElement:null);
}