var _active = 0;
var browserName = navigator.appName;
var browserVer  = parseInt( navigator.appVersion );
if (
     ( browserName == "Netscape" && browserVer >= 3 )
     ||
     ( browserName == "Microsoft Internet Explorer" && browserVer >= 4 )
     
) {
    var version = "n3";
} else {
    var version = "n2";
}

if ( version == "n3" ) {
   //------------------------------------
   image1on  = new Image();
   image1off = new Image();
   image1txt = new Image();
   image1on.src  = "images/what2.gif";
   image1off.src = "images/what1.gif";
   image1txt.src = "images/whatimg.gif";
   //------------------------------------
   image2on  = new Image();
   image2off = new Image();
   image2txt = new Image();
   image2on.src  = "images/data2.gif";
   image2off.src = "images/data1.gif";
   image2txt.src = "images/dataimg.gif";
   //------------------------------------
   image3on  = new Image();
   image3off = new Image();
   image3txt = new Image();
   image3on.src  = "images/water2.gif";
   image3off.src = "images/water1.gif";
   image3txt.src = "images/waterimg.gif";
   //------------------------------------
   image4on  = new Image();
   image4off = new Image();
   image4txt = new Image();
   image4on.src  = "images/report2.gif";
   image4off.src = "images/report1.gif";
   image4txt.src = "images/reportimg.gif";
   //------------------------------------
   image5on  = new Image();
   image5off = new Image();
   image5txt = new Image();
   image5on.src  = "images/fact2.gif";
   image5off.src = "images/fact1.gif";
   image5txt.src = "images/factimg.gif";
   //------------------------------------
   image6on  = new Image();
   image6off = new Image();
   image6txt = new Image();
   image6on.src  = "images/list2.gif";
   image6off.src = "images/list1.gif";
   image6txt.src = "images/listimg.gif";
   //------------------------------------
   image7on  = new Image();
   image7off = new Image();
   image7txt = new Image();
   image7on.src  = "images/contact2.gif";
   image7off.src = "images/contact1.gif";
   image7txt.src = "images/contactimg.gif";
   //------------------------------------
}
function img_act( imgName ) {
   if (version == "n3") {
      imgOn = eval ( imgName + "on.src" );
      document.images[imgName].src = imgOn;
      txtOn = eval ( imgName + "txt.src" );
      document.images['info'].src = txtOn
   }
}
function img_inact(imgName) {
   if ( version == "n3" ) {
      imgOff = eval(imgName + "off.src");
      document.images[imgName].src = imgOff;
      document.images['info'].src = "images/welcome_img.gif";
   }
}