browsok = (((navigator.appName == "Netscape")
&& (parseInt(navigator.appVersion) >= 3))
|| ((navigator.appName == "Microsoft Internet Explorer")
&& (parseInt(navigator.appVersion)>=3)));

base = "images/";

if(browsok){

     home1 = new Image(143, 20);
     home1.src = base+"h1.gif";
     publ1 = new Image(143, 20);
     publ1.src = base+"p1.gif";
     books1 = new Image(157, 20);
     books1.src = base+"b1.gif";
     res1 = new Image(143, 20);
     res1.src = base+"r1.gif";

     home0 = new Image(143, 20);
     home0.src = base+"h0.gif";
     publ0 = new Image(143, 20);
     publ0.src = base+"p0.gif";
     books0 = new Image(157, 20);
     books0.src = base+"b0.gif";
     res0 = new Image(143, 20);
     res0.src = base+"r0.gif";

}
function onmouseon(n){
   if(browsok){
      imageON = eval(n + "1.src");
      document [n].src = imageON;
   }
}
function onmouseoff(n){
   if(browsok){
      imageOFF = eval(n + "0.src");
      document [n].src = imageOFF;
   }
}
// end