function abrelegal(){
	anchoventana=500;
	altoventana=500;
	anchopantalla=screen.width;
	posx=(anchopantalla/2)-(anchoventana/2);
	posy=10;
	parametros="top=" + posy + ",left=" + posx + ",width=" + anchoventana + ",height=" + altoventana + ",toolbars=no,menu=no,status=no,resizable=no,scrollbars=yes";
	url="legal.php";
	nventana="legal";
	window.open(url,nventana,parametros);
}