button1=new Image();
button2=new Image();
button3=new Image();
button4=new Image();

button101=new Image();
button102=new Image();
button103=new Image();
button104=new Image();

button1.src="/images/hdrHome.gif";
button2.src="/images/hdrEntrance.gif";
button3.src="/images/hdrExit.gif";
button4.src="/images/hdrQuit.gif";

button101.src="/images/hdrHomeOn.gif";
button102.src="/images/hdrEntranceOn.gif";
button103.src="/images/hdrExitOn.gif";
button104.src="/images/hdrQuitOn.gif";


function display(num){

     if (num=="1"){
        document.images[2].src=button1.src;
     }
         if (num=="2"){
        document.images[6].src=button2.src;
     }
         if (num=="3"){
        document.images[7].src=button3.src;
     }
         if (num=="4"){
        document.images[8].src=button4.src;
     }
         if (num=="101"){
        document.images[2].src=button101.src;
     }
         if (num=="102"){
        document.images[6].src=button102.src;
     }
         if (num=="103"){
        document.images[7].src=button103.src;
     }
         if (num=="104"){
        document.images[8].src=button104.src;
    }
}