var menuOn = new Array();
var menuOff = new Array();
for( var i = 1; i <= 6; i++ )
{
    menuOn[ i ] = new Image();
	menuOn[ i ].src = 'images/menu0' + i + '.png';
	menuOff[ i ] = new Image();
	menuOff[ i ].src = 'images/menu' + i + '.png';  
}	
function Show(id,who)
{
   el = document.getElementById( 'menu' + id + who);
   if( el )
	 el.src = menuOn[ id ].src;
   el1 = document.getElementById( 'submenu' + id + who);
   if( el1 )
   {
	 el1.style.visibility='visible';
	 el1.style.display='block';
   }
} 

function Hide(id,who)
{
   el = document.getElementById( 'menu' + id + who);
   if( el )
	 el.src = menuOff[ id ].src;
   el1 = document.getElementById( 'submenu' + id + who);
   if( el1 )
   {
	 el1.style.visibility='hidden';
	 el1.style.display='none';
   }
} 

function back_href()
{
  history.back();
  return false;
}