function MM_openBrWindow(theURL,winName,features) { //v2.0
	
	//Abre la ventana
	var ven = window.open(theURL,winName,features);
	
	// Centra la ventana
	var top = (screen.height - ven.document.body.clientHeight)/2;
	var left = (screen.width - ven.document.body.clientWidth)/2;
	ven.moveTo(left,top);
}