var subs=new Array('sub_menu_content');
var zeit='';
function tmeout()
{
  zeit=setTimeout('hideall()',1200);
}
function hideall()
{
  for(x=0; x<subs.length;x++)
  {
    document.getElementById(subs[x]).style.visibility='hidden';
  }
}
function display(ele)
{
  clearTimeout(zeit);
  for(x=0; x<subs.length;x++)
  {
    if(subs[x]!=ele)
    {
      document.getElementById(subs[x]).style.visibility='hidden';
    }
  }
  document.getElementById(ele).style.visibility='visible';
}