function change(Name,No) {
     if (!document.images) {}
     else document.images[Name].src = eval("PLImgArray[" + No + "].src");
}

PLImgArray = new Array;
function PreLoadImgs(base,name) {
var j,imgFiles = PreLoadImgs.arguments;
	if (document.images) {
		for (var i=2; i<imgFiles.length; i++) {
			j = base*10+imgFiles[i];
			PLImgArray[j] = new Image;
			PLImgArray[j].src = name + imgFiles[i] + ".gif";
		}
	}
}

PreLoadImgs(0,'itechome',0,1);
PreLoadImgs(1,'deptinfo',0,1,2,3,4,5,6);
PreLoadImgs(2,'jobs',0,1,2,3,4,5);
PreLoadImgs(3,'students',0,1,2,3,4,5,6);
PreLoadImgs(4,'other',0,1,2,3,4,5,6);