browserName = navigator.appName;
browserVer = parseInt ( navigator.appVersion );
version = "n2";

if ( browserName == "Netscape" && browserVer >= 3 ) version = "n3";
if ( browserName == "Microsoft Internet Explorer" && browserVer >= 4 ) version = "e4";

if ( version == "n3" || version == "e4" ) {
   Home_On      = new Image ( 68 , 58 );
   Home_Off     = new Image ( 68, 58 );
   Whoarewe_On  = new Image ( 68 , 58 );
   Whoarewe_Off = new Image ( 68, 58 );
   Events_On    = new Image ( 68 , 58 );
   Events_Off   = new Image ( 68, 58 );
   Site_Map_On  = new Image ( 68 , 58 );
   Site_Map_Off = new Image ( 68, 58 );
        
   Home_On.src      = "images/Buttons/Hover/Home-On.gif";
   Home_Off.src     = "images/Buttons/Hover/Home-Off.gif";
   Whoarewe_On.src  = "images/Buttons/Hover/Whoarewe-On.gif";
   Whoarewe_Off.src = "images/Buttons/Hover/Whoarewe-Off.gif";
   Events_On.src    = "images/Buttons/Hover/Events-On.gif";
   Events_Off.src   = "images/Buttons/Hover/Events-Off.gif";
   Site_Map_On.src  = "images/Buttons/Hover/Site-Map-On.gif";
   Site_Map_Off.src = "images/Buttons/Hover/Site-Map-Off.gif";        
        
}
function button_on ( imgName ) {
   if (version == "n3" || version == "e4") {
      butOn = eval(imgName + "_On.src");
      document [imgName].src = butOn;
   }
}
function button_off ( imgName ) {
   if (version == "n3" || version == "e4") {
      butOff = eval(imgName + "_Off.src");
      document [imgName].src = butOff;
   }
}
function openwindow(url,win_nam,scr_x,scr_y) {
   var scrnw=scr_x;
   var scrnh=scr_y;
   var scrnx=(screen.width-scrnw)/2;
   var scrny=(screen.height-scrnh)/2;
   var winam=win_nam;
   var setng="resizable=yes,scrollbars=no,toolbar=no,width="+scrnw+",height="+scrnh+",screenX="+scrnx+",screenY="+scrny+",left="+scrnx+",top="+scrny;
   var childwindow=window.open(url,winam,setng);
}