explorer_ = (document.all)	? 1 : 0;
var ua = window.navigator.userAgent
var msie = ua.indexOf ( "MSIE " )
var vie=0
if (explorer_&&msie>0)	
    vie= parseInt(ua.substring (msie+5, ua.indexOf (".", msie )))

function show1(lay1)
{if (explorer_)	
 {
   if(vie>4)
     {document.all[lay1].style.visibility = 'visible';}
 } 
 else
  {document.layers[lay1].visibility='show';}
}

function hide(lay1)
{if (explorer_)	
 {if(vie>4)
   {document.all[lay1].style.visibility = 'hidden';}
 } 
 else
 {document.layers[lay1].visibility='hiden';}
}