var iekrk4=document.all&&navigator.userAgent.indexOf("Opera")==-1;
var nskrk6=document.getElementById&&navigator.userAgent.indexOf("Opera")==-1;

function hideAdv(content)
{

 if(iekrk4)
 {
  showContentObj=document.all.krk_div;
 }
 if(nskrk6)
 {
  showContentObj=document.getElementById("krk_div");
 }
 if(iekrk4||nskrk6)
 {
  if(showContentObj.innerHTML!=content)
  {
   showContentObj.innerHTML=content;
  }
  else
  {
   showContentObj.innerHTML="";
  }
 }
}