var Ancho = (screen.width) / 2;
var Alto = (screen.height) / 2;

function openWindowRecomendar(B, P) {
	var AnchoLocal = 480;
	var AltoLocal = 400;
	var Left = Ancho - (AnchoLocal / 2);
	var Top = Alto - (AltoLocal / 2);
	var link = B+'?ID='+P;
	var titulo = '';
	var param = 'location=0,menubar=0,resizable=0,width=' + AnchoLocal + ',height=' + AltoLocal + ',scrollbars=1,left=' + Left + ',top=' + Top;
	window.open(link , titulo, param);
}