function abrir() {
	wid=350
	hei=250
	que='aviso_legal.php'
	Fenetre=0
	if (Fenetre && navigator.appName=='Microsoft Internet Explorer') Fenetre.close();
	Izda=(screen.width-wid)/2
	Arriba=(screen.height-hei)/2
	wid=wid+25
	cadena='width='+wid+',height='+hei+',top='+Arriba+',left='+Izda+',toolbar=no,location=no,status=no,menubar=no,resizable=no,scrollbars=yes'
	Fenetre=window.open(que,'vent3',cadena)
	Fenetre.moveTo(Izda,Arriba)
	Fenetre.focus()
}