function newImage(arg) {
     if (document.images) {
          rslt = new Image();
          rslt.src = arg;
          return rslt;
     }
}

function changeImages() {
     if (document.images && (preloadFlag == true)) {
          for (var i=0; i<changeImages.arguments.length; i+=2) {
               document[changeImages.arguments[i]].src = ("I:\wwwWork"+changeImages.arguments[i+1]);
          }
     }
}

var preloadFlag = false;

function preloadImages() {
     if (document.images) {
		about_o = newImage("/images/about_on.gif");
		services_o = newImage("/images/services_on.gif");
		contact_o = newImage("/images/contact_on.gif");
		public_o = newImage("/images/public_on.gif");
		personnel_o = newImage("/images/personnel_on.gif");
		publications_o = newImage("/images/publications_on.gif");
		clinical_o = newImage("/images/clinical_on.gif");
		preloadFlag = true;
	}
}