function preimg() {
	var d = document;
	if(d.images){
		if(!d.My_IMG) d.My_IMG = new Array();
		var i , j = d.My_IMG.length , a = preimg.arguments;
		for(i=0; i<a.length; i++) if (a[i].indexOf("#")!=0){
			d.My_IMG[j] = new Image;
			d.My_IMG[j++].src = a[i];
		}
	}
}

function chgimg(imgName,img) {
	document.images[imgName].src = img;
}