jquery select iframe children

I am using the editArea library and jquery to do what i need...

http://www.cdolivet.com/index.php?page=editArea&sess=2b8243f679e0d472397bfa959e1d3841

so in my html there is an iframe tag that editArea uses what i need is to access something like so with jquery

$('iframe textarea').keydown(function (e){
   number = 17; //any number really :)
    if(e.which == number){
        //do something...
        alert('Done...');
    }
});

I tried the above but it looks like it is not detecting that key. but it works if selector was $(document) therefore the rest of the function works it's just it's not picking up the iframes textarea keydown

any ideas? Thanks