JQuery :: Dynamically Loading Source From A String Into The DOM

I'm experimenting with dynamic loading of javascript using JQuery. So basically I have a loadScript function that accepts either the URL of a JS file or a javascript source in a string. For the former, I create a 'script' element, set its src attribute to the URL of the file and insert the element into the DOM's head element. So far it seems to work nicely. For the latter, I create a 'script' element, set its innerHTML to the JS string and insert it into the DOM's head element. This doesn't work so well. I *think* it's because the JS source in question contains:

$(document).ready(function() {
// put all your jQuery goodness in here.
});

It looks like the JS source in my string is stomping over parts of the DOM it shouldn't and changing existing elements.