var isNN = (navigator.appName.indexOf("Netscape") != -1);
 var isIE = (navigator.appName.indexOf("Microsoft") != -1);
 
 function showHideDiv(obj)
 {
   var s;
   if(isIE)
   {
     s = document.all[obj].style.display;
     if(s == 'block')
     {
       s = 'none';
     }else{
       s = 'block';
     }
     document.all[obj].style.display = s;
   }else{
   	obj = document.getElementById(obj);
     s = obj.style.display;
     if(s == 'block')
     {
       s = 'none';
     }else{
       s = 'block';
     }
     obj.setAttribute('style','display:'+s);
   }
}