document.onkeydown = checkKey; 

function checkKey(evt){
 var evt = (evt) ? evt : ((event) ? event : null);
 var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
	if (evt.keyCode == 123){
		document.getElementById('hidelogin').style.visibility='visible';
		document.getElementById('header_search').style.visibility='visible';
	}
}

function changeBox(div1, div2, name)
{
   document.getElementById(div1).style.display='none';
   document.getElementById(div2).style.display='';
   document.getElementById(name).focus();
}
function restoreBox(div1, div2, name)
{
   if(document.getElementById(name).value=='')
   {
     document.getElementById(div1).style.display='';
     document.getElementById(div2).style.display='none';
   }
}