function popupShow (URL){
	$('body').append('<div id="popup_fondo" /><div id="popup" />');
	//$('#popup_fondo').fadeIn();
	$("#popup_fondo").css({
                opacity: 0.65,
                width: $(window).width(),
                height: $(window).height()
            }).fadeIn();
	$("#popup").load(URL,function(){
		   var margen_top = ($(window).height() - $('#popup').height())/2;
		   var margen_left = ($(window).width() - $('#popup').width())/2;
		   if (margen_top>=0) $('#popup').css("top",margen_top);
				else $('#popup').css("top",0);
		   if (margen_left>=0) $('#popup').css("left",margen_left);
				else $('#popup').css("left",0);	
    });
	$('embed, object, select').css({ 'visibility': 'hidden' });
}

function popupHide () {
	$("#popup_fondo").fadeOut("fast",function () {
		$("#popup_fondo").remove(); 
	    $("#popup").remove(); 
	});
	$('embed, object, select').css({ 'visibility': 'visible' });
}