submenus=new Array();

function buscarSubmenus() {
	var i=0;
	var elemento;
	while ( true ) {
		elemento=document.getElementById ( "sub"+i );
		if ( elemento!=null ) {
			submenus[i]=elemento;
			i++;
		} else {
			break;
		}
	}
}

function abrir ( n ) {
	var i=0;
	var elemento=submenus[n];

	if ( elemento.style.display=="none" ) {
		for ( i;i<submenus.length;i++ ) {
			submenus[i].style.display= ( i==n ) ? "" : "none";
		}
	} else {
		elemento.style.display="none";
	}
}