// JavaScript Document

function chSrc(obj, num) { //v2.7 by PVII//rewritten by john@hitstatemedia.com
	var picID = document.getElementById(obj);
	var temp=picID.firstChild.src;
	if(num==1){
		var tmpsrc = (temp.substr(0,temp.length-4))+"_over.jpg";
		//alert(tmpsrc);
		picID.firstChild.src = tmpsrc;
	}else if(num==0){
		var tmpsrc = (temp.substr(0,temp.length-9))+".jpg";
		picID.firstChild.src = tmpsrc;
	}
}
function setNav(){
	var nav = document.getElementById('nav');
	var links = nav.getElementsByTagName('a');
	var len = links.length;
	for(var i=0;i<len;i++){
		if(links[i].title!='home'){
				links[i].onmouseover = function(){ 
				chSrc(this.id,1);
			};
			links[i].onmouseout = function(){
				chSrc(this.id,0);
			};
		}

	}
}
/* grab Elements from the DOM by className */
function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}
function assignRollovers(){
	if(!document.getElementById) return;
	var aPreLoad = new Array();
	var rovers = getElementsByClass('rollover');
	var len = rovers.length;
	for(var i=0;i<len;i++){
		var src = rovers[i].getAttribute('src');
		var fileExt = src.substring(src.lastIndexOf('.'), src.length);
		var hsrc = src.replace(fileExt, '_over'+fileExt);
		rovers[i].setAttribute('hsrc', hsrc);
		aPreLoad[i] = new Image();
		aPreLoad[i].src = hsrc;
		rovers[i].onmouseover = function() {
			sTempSrc = this.getAttribute('src');
			this.setAttribute('src', this.getAttribute('hsrc'));
		}	
		rovers[i].onmouseout = function() {
			if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+fileExt, fileExt);
			this.setAttribute('src', sTempSrc);
		}
	}	
}
/* window 'load' attachment */
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	}
	else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}
addLoadEvent(setNav);
addLoadEvent(assignRollovers);