How can I dynamically resize the jQuery Colorbox plugin?

To dynamicly resize colorbox you want to say.

colorbox.resize({width:"300px" , height:"300px"})

If you want to resize a color box that loads an Iframe you would add something like this to the head of your target document.

$(document).ready(function(){
    var x = $('mydiv').width();
    var y = $('mydiv').height();

    parent.$.colorbox.resize({width:x, height:y});

});