function blink() 
{ 
    if (!document.all) 
      return; 
    else 
    { 
        for (i=0;i<document.all.tags('blink').length;i++)
        { 
             s=document.all.tags('blink')[i]; 
             s.style.visibility=(s.style.visibility=='visible')?'hidden':'visible'; 
        } 
    } 
}