var aImgPreloader = new Array;

var urlRoot="layout/";
aImgPreloader[aImgPreloader.length] = new Array('yb_registernow',urlRoot+'yb_registernow.gif',urlRoot+'yb_registernow_mo.gif');

aImgPreloader[aImgPreloader.length] = new Array('nav_yourcenter',urlRoot+'nav_yourcenter.gif',urlRoot+'nav_yourcenter_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('nav_yourhealth',urlRoot+'nav_yourhealth.gif',urlRoot+'nav_yourhealth_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('nav_yourwellbeing',urlRoot+'nav_yourwellbeing.gif',urlRoot+'nav_yourwellbeing_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('nav_findhelp',urlRoot+'nav_findhelp.gif',urlRoot+'nav_findhelp_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('nav_theatreevents',urlRoot+'nav_theatreevents.gif',urlRoot+'nav_theatreevents_mo.gif');
aImgPreloader[aImgPreloader.length] = new Array('nav_supportus',urlRoot+'nav_supportus.gif',urlRoot+'nav_supportus_mo.gif');

aImgPreloader[aImgPreloader.length] = new Array('yb_gotoyouraccount',urlRoot+'yb_gotoyouraccount.gif',urlRoot+'yb_gotoyouraccount_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;


		}
	}
}