function show_menu(id,name)
{
	if(document.getElementById('d'+id)) document.getElementById('d'+id).style.visibility='visible';
	if(document.getElementById('a'+id)) document.getElementById('a'+id).className=name+'_hover';
}
function hide_menu(id,name)
{
	if(document.getElementById('d'+id)) document.getElementById('d'+id).style.visibility='hidden';
	if(document.getElementById('a'+id)) document.getElementById('a'+id).className=name;
}