function imgerr(){
var theImg = new Image();
	theImg.src='http://www.navsat.co.uk/skins/twilight/styleImages/unavailable-prod.gif';
	for(var i=0;i<document.images.length;i++){
		var cpyImg = new Image();
		cpyImg.src = document.images[i].src;
		if(!cpyImg.width){
			document.images[i].src = theImg.src;
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", imgerr);