if (document.images) {

 function turnOn(imageName) {
   if (document.images) {
     document[imageName].src = "img/"+imageName+"2.gif";
   }
 }

 function turnOff(imageName) {
   if (document.images) {
     document[imageName].src = "img/"+imageName+".gif";
   }
 }
}

function wopen(wurl,h,w,name)
        {window.open(wurl,'Map','height='+h+',width='+w+',resizable=no,scrollbars=yes,menubar=no,status=no');}