//detect browser:
 browserName = navigator.appName;
 browserVer = parseInt(navigator.appVersion);
 if (browserName == "Netscape" && browserVer >= 3) browserVer = "1";
 else if (browserName == "Microsoft Internet Explorer" && browserVer == 4) browserVer = "1";
 else browserVer = "2";

 //preload images:
 if (browserVer == 1) {
 b1 = new Image(147,29);
 b1.src = "/PHDCN/images/about2.gif";
 b2 = new Image(147,29);
 b2.src = "/PHDCN/images/about2-on.gif";
 b3 = new Image(147,23);
 b3.src = "/PHDCN/images/announce2.gif";
 b4 = new Image(147,23);
 b4.src = "/PHDCN/images/announce2-on.gif";
 b5 = new Image(147,24);
 b5.src = "/PHDCN/images/daa2.gif";
 b6 = new Image(147,24);
 b6.src = "/PHDCN/images/daa2-on.gif";
 b7 = new Image(147,24);
 b7.src = "/PHDCN/images/publications2.gif";
 b8 = new Image(147,24);
 b8.src = "/PHDCN/images/publications2-on.gif";
 b9 = new Image(147,24);
 b9.src = "/PHDCN/images/method2.gif";
 b10 = new Image(147,24);
 b10.src = "/PHDCN/images/method2-on.gif";
 b11 = new Image(147,24);
 b11.src = "/PHDCN/images/resources2.gif";
 b12 = new Image(147,24);
 b12.src = "/PHDCN/images/resources2-on.gif";
 b13 = new Image(147,24);
 b13.src = "/PHDCN/images/help2.gif";
 b14 = new Image(147,24);
 b14.src = "/PHDCN/images/help2-on.gif";
 b17 = new Image(147,24);
 b17.src = "/PHDCN/images/sitemap2.gif";
 b18 = new Image(147,24);
 b18.src = "/PHDCN/images/sitemap2-on.gif";
 b19 = new Image(147,24);
 b19.src = "/PHDCN/images/contact2.gif";
 b20 = new Image(147,24);
 b20.src = "/PHDCN/images/contact2-on.gif";
 b21 = new Image(147,24);
 b21.src = "/PHDCN/images/home2.gif";
 b22 = new Image(147,24);
 b22.src = "/PHDCN/images/home2-on.gif";
 b23 = new Image(147,24);
 b23.src = "/PHDCN/images/instruments2.gif";
 b24 = new Image(147,24);
 b24.src = "/PHDCN/images/instruments2-on.gif";
 }

 //image swapping function:
 function hiLite(imgDocID, imgObjName, comment) {
 if (browserVer == 1) {
 document.images[imgDocID].src = eval(imgObjName + ".src");
 window.status = comment; return true;
 }}
 //end hiding -->