function abrirventana(url,nombre,ancho,alto){
	PosX = (screen.availWidth - ancho)/2;
	PosY = (screen.availHeight - alto)/2;
	window.open(url,nombre,'width='+ ancho + ',height=' + alto + ',left=' + PosX + ',top=' + PosY+',scrollbars=no,menubar=no,toolbar=no,location=no')
	}
function abrirventanasc(url,nombre,ancho,alto){
	PosX = (screen.availWidth - ancho)/2;
	PosY = (screen.availHeight - alto)/2;
	window.open(url,nombre,'width='+ ancho + ',height=' + alto + ',left=' + PosX + ',top=' + PosY+',scrollbars=yes,menubar=no,toolbar=no,location=no')
	}