Image preloader not working in IE

<script type="text/javascript">
<!--
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
/**************************************************  **
*	        DOM Image rollover:
*		by Chris Poole
*		http://chrispoole.com
*               Script featured on http://www.dynamicdrive.com
*		Keep this notice intact to use it :-)
**************************************************  **/

function init() {
  if (!document.getElementById) return
  var imgOriginSrc;
  var imgTemp = new Array();
  var imgarr = document.getElementsByTagName('img');
  for (var i = 0; i < imgarr.length; i++) {
    if (imgarr[i].getAttribute('hsrc')) {
        imgTemp[i] = newImage(imgarr[i].getAttribute('hsrc'));
        imgarr[i].onmouseover = function() {
            imgOriginSrc = this.getAttribute('src');
            this.setAttribute('src',this.getAttribute('hsrc'))  
        }
        imgarr[i].onmouseout = function() {
            this.setAttribute('src',imgOriginSrc)
        }
    }
  }
}
// -->
</script>