function popup(pag)
{
	var myLeft = (screen.width-600)/2;
    var myTop = (screen.height-480)/2;
	
	ventana = window.open(pag, "_blank", "resizable=no,scrollbars=yes,height=480,width=600,top="+myTop+",left="+myLeft);
}
function popuppeq2(pag)
{
	var myLeft = (screen.width-300)/2;
    var myTop = (screen.height-350)/2;

	ventana = window.open(pag, "_blank", "resizable=no,scrollbars=no,height=350,width=300,top="+myTop+",left="+myLeft);
}