menu_hash = new Array();

function OpenSubMenu(sub_menu )
{
	document.getElementById(sub_menu ).style.visibility = "visible";
    menu_hash[ sub_menu  ] = true;
}

function CloseSubMenu( sub_menu  )
{
	setTimeout( "HideSubMenu('" + sub_menu  + "');", 100 );
	menu_hash[ sub_menu  ] = false;
}
		 
function HideSubMenu( sub_menu  )
{
	if( !menu_hash[ sub_menu  ] )
	{
		document.getElementById(sub_menu ).style.visibility = "hidden";
	}
}


function OpenSubMenuOnImg(img_id,ref)
{
	document.getElementById(img_id).src = ref;
	document.getElementById(img_id).style.visibility = "visible";
}

function CloseSubMenuOnImg(img_id,ref)
{
	document.getElementById(img_id).src = ref;
	document.getElementById(img_id).style.visibility = "hidden";
}