var aImgPreloader = new Array;

var urlRoot="../images/wrpr/";
aImgPreloader[aImgPreloader.length] = new Array('tab_adopt',urlRoot+'tab_adopt.jpg',urlRoot+'tab_adopt_mo.jpg');
aImgPreloader[aImgPreloader.length] = new Array('tab_advocate',urlRoot+'tab_advocate.jpg',urlRoot+'tab_advocate_mo.jpg');
aImgPreloader[aImgPreloader.length] = new Array('tab_donate',urlRoot+'tab_donate.jpg',urlRoot+'tab_donate_mo.jpg');
aImgPreloader[aImgPreloader.length] = new Array('tab_volunteer',urlRoot+'tab_volunteer.jpg',urlRoot+'tab_volunteer_mo.jpg');

// 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;


		}
	}
}