var def = new Array("../images/layout_r3_c2.gif","../images/layout_r3_c3.gif","../images/layout_r3_c4.gif","../images/layout_r3_c5.gif","../images/layout_r3_c6.gif");
	var subN = new Array("subMenu1","subMenu2","subMenu3","subMenu4","subMenu5");
	var down = new Array("images/layoutdown_r3_c2.gif","images/layoutdown_r3_c3.gif","images/layoutdown_r3_c4.gif","images/layoutdown_r3_c5.gif","images/layoutdown_r3_c6.gif");

	var checkHide;
	var allowHide = false;
	var lastMenu = null;
	var count = 1;

function swapImage(imgid,newsrc){
	document.getElementById(imgid).src = newsrc;
}

function MM_preloadImages() { 
	var a = new Array("..images/layout_r2_c2.jpg","..images/layoutover_r3_c2.gif","..images/layoutover_r3_c3.gif","..images/layoutover_r3_c4.gif","..images/layoutover_r3_c5.gif","..images/layoutover_r3_c6.gif");
	if(!document.imgLoad){ document.imgLoad = new Array(); }
		for(var i=0;i<a.length;i++){
			document.imgLoad[i] = new Image();
			document.imgLoad[i].src = a[i];
		}
}

function dropDown(id,src){
	if(document.getElementById(id)){
		allowHide = false;
		id = parseInt(id.replace("subMenu",""));
		var currSrc = document.getElementById("Image"+(id+4)).src.replace("http://www.eecl.colostate.edu/","");
		if(lastMenu!=null && id!=lastMenu && currSrc != down[id-1]){
			document.getElementById("Image"+(lastMenu+4)).src = def[lastMenu-1];
			document.getElementById(subN[lastMenu-1]).style.display = "none";
		}
		if(currSrc != down[id-1]){
			lastMenu = id;
			document.getElementById("Image"+(id+4)).src = src;
			//document.getElementById(subN[id-1]).style.display = "block";
		}
		else{
			hide();
		}
	}
}

function hide(){
	allowHide = true;
	//var func = "intHide()";
	//clearTimeout(checkHide);
	//checkHide = setTimeout(func,500);
	intHide();
}
	
function intHide(){
	if(allowHide){
		//clearTimeout(checkHide);
		allowHide = false;
		if(lastMenu!=null){
			document.getElementById("Image"+(lastMenu+4)).src = def[lastMenu-1];
			document.getElementById(subN[lastMenu-1]).style.display = "none";
		}
		lastMenu = null;
	}
}