function preloadImages() {
	var d=document;
		if(d.images) {
			if(!d.p) d.p=new Array();
    		var i,j=d.p.length,a=preloadImages.arguments;
			for(i=0; i<a.length; i++)
			if (a[i].indexOf("#")!=0) {
			d.p[j]=new Image; d.p[j++].src=a[i];
			}
		}
}


function showBranch (branch, imgID) {
	var objBranch = document.getElementById(branch).style;
	var objImage = document.getElementById(imgID);
	
	if(objBranch.display=="block") {
		objBranch.display="none";
		objImage.src="../images/blueArrow.jpg";
		}
	else {
		objBranch.display="block";
		objImage.src="../images/redArrow.jpg";
		}
}