function getStyle()
{
 var temp = document.getElementById("mail").style.visibility;

 return temp;
}

function switchMain()
{
 var current = getStyle();
 if( current == "visible" )
  {
   document.getElementById("mail").style.visibility = "hidden";
   document.all.mailform.src="emailit.php";
  }
 else
  {
   document.getElementById("mail").style.visibility = "visible";
  }
}