var aImgPreloader = new Array;

var urlRoot="../images";

aImgPreloader[aImgPreloader.length] = new Array('menu_home',urlRoot+'/wrapper/menu_home.gif',urlRoot+'/wrapper/menu_home_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('menu_aboutus',urlRoot+'/wrapper/menu_aboutus.gif',urlRoot+'/wrapper/menu_aboutus_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('menu_newsroom',urlRoot+'/wrapper/menu_newsroom.gif',urlRoot+'/wrapper/menu_newsroom_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('menu_registry',urlRoot+'/wrapper/menu_registry.gif',urlRoot+'/wrapper/menu_registry_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('menu_donatetoday',urlRoot+'/wrapper/menu_donatetoday.gif',urlRoot+'/wrapper/menu_donatetoday_mo.gif');

// load up image container object based on previous array
var oImgContainer = new Object;
for(i=0;i<aImgPreloader.length;i++){
	if(document.images){
		oImgContainer[aImgPreloader[i][0]] = new Image;
		oImgContainer[aImgPreloader[i][0]].src = aImgPreloader[i][1];
		oImgContainer[aImgPreloader[i][0] + 'On'] = new Image;
		oImgContainer[aImgPreloader[i][0] + 'On'].src = aImgPreloader[i][2];
	}
}

// rollover function
// image name (sImg) corresponds with aImgPreloader and name attribute of tag
function roll(sImg,bOver){
	if(document.images){
		if (bOver) {
			document.images[sImg].src = oImgContainer[sImg + 'On'].src;
		} else {
			document.images[sImg].src = oImgContainer[sImg].src;


		}
	}
}

function showTheBook(){
	document.getElementById("navcontsub_thebook").style.visibility='visible';	
}
function hideTheBook(){
	document.getElementById("navcontsub_thebook").style.visibility='hidden';	
}

function showCollaboration(){
	document.getElementById("navcontsub_collaboration").style.visibility='visible';	
}
function hideCollaboration(){
	document.getElementById("navcontsub_collaboration").style.visibility='hidden';	
}

function showResources(){
	document.getElementById("navcontsub_resources").style.visibility='visible';	
}
function hideResources(){
	document.getElementById("navcontsub_resources").style.visibility='hidden';	
}