sfHover = function() {
	var sfEls = document.getElementById("page-nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);


function getPreloadImages() {
	if (arguments.length == 0) return false;
	
	returnArray = new Array();
	for(var i=0; i<arguments.length; i++) {
		returnArray.push(getPreloadImage(arguments[i]));
	}
	
	return returnArray;
}

function getPreloadImage($imgsrc) {
	if (!$imgsrc) return false;
	
	picObj = new Image();
	picObj.src =$imgsrc;
	
	return picObj;
}

// doesn't put in objects, just loads them and hopefully they get in the cache
function preloadImages() {
	if (arguments.length == 0) return false;
	picObj = new Image();
	
	for(var i=0; i<arguments.length; i++) {
		picObj.src = arguments[i];
	}
	
	return true;
}


// takes imgid, changes its src to the src of the object identified by "imgid_swapto"
function swapImg (imgid, swapto) {
	theImg = document.getElementById(imgid);
	eval('theImg.src = '+imgid+'_'+swapto+'.src');
}