function preLoad(imgList) {
	var loadedImg = new Array();
	if (document.images) {
		for(var i = 0; i < imgList.length; i++) {
			var tmp = new Image();
			tmp.src = imgList[i];
			loadedImg[i] = tmp;
		}
	}
}

function rollIt(imgId, rollSrc) {
	dynamItElem(imgId).src = rollSrc;
}

function dynamItElem(obj) {
    try {
        if(typeof(obj) == 'object')
            return obj;
        else
            return document.getElementById(obj);
    }
    catch(e) {
        return null;
    }
}