var openedMenu = null;
var submenuTimer;


function menuOvr(id){

	if (openedMenu && openedMenu != id){
		CloseMenu(id);
	}

	OpenMenu(id);
}


function OpenMenu(id){ 
	if ( document.getElementById ){
		document.getElementById( id ).style.visibility = 'visible';
	}else if ( document.all ){
		document.all( id ).style.visibility = 'visible';
	}else if ( document.layers ){
		document.layers[ id ].visibility = 'show';
	}
	clearTimeout(submenuTimer);
	openedMenu = id;

}


function CloseMenu(){ 
	if ( document.getElementById ){
		document.getElementById( openedMenu ).style.visibility = 'hidden';
	}else if ( document.all ){
		document.all( openedMenu ).style.visibility = 'hidden';
	}else if ( document.layers ){
		document.layers[ openedMenu ].visibility = 'hide';
	}
	openedMenu = null;
}