browserName = navigator.appName;   // detect browser
browserVer = parseInt(navigator.appVersion);
if (((navigator.appName == "Netscape") && (parseInt (navigator.appVersion) >= 3)) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt (navigator.appVersion) >= 4))) version = "n3";
     else version = "n2";
  
     if (version == "n3") {
    
	 menu1on = new Image();
     menu1on.src = "pic/home1.gif"
     menu1off = new Image();
     menu1off.src = "pic/home.gif";
	 
 	 menu2on = new Image();
     menu2on.src = "pic/book1.gif"
     menu2off = new Image();
     menu2off.src = "pic/book.gif";
	 
 	 menu3on = new Image();
     menu3on.src = "pic/seminar1.gif"
     menu3off = new Image();
     menu3off.src = "pic/seminar.gif";
	 	 
 	 menu4on = new Image();
     menu4on.src = "pic/event1.gif"
     menu4off = new Image();
     menu4off.src = "pic/event.gif";
	 
	 menu5on = new Image();
     menu5on.src = "pic/contact1.gif"
     menu5off = new Image();
     menu5off.src = "pic/contact.gif";
	 
 	 menu6on = new Image();
     menu6on.src = "pic/test1.gif"
     menu6off = new Image();
     menu6off.src = "pic/test.gif";
	 
}

function img_act(imgName) {
     if (version == "n3") {
     document[imgName].src = eval(imgName + "on.src");
          }
}

function img_inact(imgName) {
     if (version == "n3") {
     document[imgName].src = eval(imgName + "off.src");
     }

}