browserName = navigator.appName;browserVer = parseInt(navigator.appVersion);if (browserName == "Netscape" && browserVer >= 3 || browserName == "Microsoft Internet Explorer" && browserVer>=4) {        version = "n3";}else {        version = "x";}  if (version == "n3") { block1on = new Image();   	block1on.src = "images/home.gif";    block1off = new Image();   	block1off.src = "images/home_.gif";block2on = new Image();   	block2on.src = "images/bio.gif";   block2off = new Image();   block2off.src = "images/bio_.gif";block3on = new Image();   	block3on.src = "images/disco_.gif";   block3off = new Image(); block3off.src = "images/disco.gif";block4on = new Image();   	block4on.src = "images/download_.gif";   block4off = new Image();   	block4off.src = "images/download.gif";block5on = new Image();   	block5on.src = "images/contact.gif"; block5off = new Image();   	block5off.src = "images/contact_.gif";}function img_act(imgName)  {   if (version == "n3")   {   imgOn = eval(imgName + "on.src");   document [imgName].src = imgOn;   }}function img_inact(imgName)   {   if (version == "n3") {   imgOff = eval(imgName + "off.src");   document [imgName].src = imgOff;   }}