Inputfield bugs in Internet Explorer when text is filled out

I've run into one of many Internet Explorer bugs ;)

I'm doing some custom styled input fields and they work exactly as supposed in all browsers, except IE! The inputfields have some padding added on both sides, which works fine on load when the input field isnt filled out with text. But whenever the inputfield gets filled out with text, it kind of ignores the padding tha开发者_Go百科t it has been given..

I've uploaded a screenshot of the problem:

...and made a very simple example so you can try for yourself: http://valuable.dk/test.htm

How do I solve this :) ?