browserName=navigator.appName;

browserVer=parseInt(navigator.appVersion);

if ((browserName=="Netscape" && browserVer >= 3) || (browserName=="Microsoft Internet Explorer" && browserVer >=4)) {

ver="works";

// preload images...
if (document.images) {

img1 = new Image(162, 24);
img1.src = "/images/keyskills.gif";

img2 = new Image(162, 24);
img2.src = "/images/keyskills-over.gif";

img3 = new Image(176, 24);
img3.src = "/images/learning.gif";

img4 = new Image(176, 24);
img4.src = "/images/learning-over.gif";

}

} else {

ver="doesnt";

}

function img_display(source,id) {

  if (ver=="works") {

    document [id].src=source;

  }

}