Appending Link To Head Of Iframe

I want to append element To head of an Iframe (fancybox)

there is a strange problem : when I use Firefox to Breakpoint on line of code that append element to Head it works correctly but when I run site normally without firebug it does not work;

I am using fancybox 1.3.4 and the code run in onComplete event

var cssLink = document.createElement("link") 
cssLink.href = "/themes/furniture/css/test.css"; 
cssLink .rel = "stylesheet"; 
cssLink .type = "text/css"; 


var f123= document.getElementById('fancybox-frame');

var d123= f123.contentDocument || f123.contentWindow.document;

d123.head.appendChild(cssLink);

UPDATE

I also try this code

var $head = $("#fancybox-frame").contents().find("head");                
$head.append($("<link/>", 
{ rel: "stylesheet", href: "/themes/furniture/css/test.css", type: "text/css" } ));

but it does not work either

Tnx

Well, it seems to be a racing condition indeed (as pointed out by olsn in his comment) between loading the iframe and finding elements inside of it, which fails if the second occurs first ;)

As a workaround, you could use the .load() method to wait for the iframe to be completely loaded before trying to append the stylesheet to the <head> section.

This code should do the trick :

$(document).ready(function () {
    $(".fancybox").fancybox({
        "type": "iframe",
        "onComplete": function () {
            var $style = '<link rel="stylesheet" href="/themes/furniture/css/test.css" type="text/css" />';
            $("#fancybox-frame").load(function () {
                $(this).contents().find("head").append($style);
            });
        }
    });
});

Note : this is for fancybox v1.3.4. Fortunately v2.x includes more flexible public methods than v1.3.4 to circumvent this issue, like afterLoad and beforeShow

Also notice that setTimeout() will work too, but it renders oddly.