//hides all select elements
function showPopup(){
      var nVer = navigator.appVersion;
      var nAgt = navigator.userAgent;
      var browserName  = '';
      var fullVersion  = 0; 
      var majorVersion = 0;
      if ((verOffset=nAgt.indexOf("MSIE"))!=-1)
      {
       browserName  = "MSIE";
       fullVersion  = parseFloat(nAgt.substring(verOffset+5));
       majorVersion = parseInt(''+fullVersion);
      }
      if ((browserName=="MSIE") && majorVersion<7)
      {
      	var oSelects=document.getElementsByTagName("select");
      	for(var i=0;i<oSelects.length;i++)
      		oSelects[i].className+=" hide";
      }
      Element.show('callback_status');
    }
    function hidePopup(){
      var nVer = navigator.appVersion;
      var nAgt = navigator.userAgent;
      var browserName  = '';
      var fullVersion  = 0; 
      var majorVersion = 0;
      
      if ((verOffset=nAgt.indexOf("MSIE"))!=-1)
      {
       browserName  = "MSIE";
       fullVersion  = parseFloat(nAgt.substring(verOffset+5));
       majorVersion = parseInt(''+fullVersion);
      }
      
      if ((browserName=="MSIE") && majorVersion<7)
      {
      	var oSelects=document.getElementsByTagName("select");
      	for(var i=0;i<oSelects.length;i++)
      		oSelects[i].className=oSelects[i].className.replace(" hide","");
      }
      Element.hide('callback_status');
    }