Problem with Thesis Header

Hi guys, I got a little problem that with adding a custom header to thesis 1.7 .
Now, I tried various css codes from different sites and neither do the job well.

What I want to do is take a crap header, and put it directly above the navigation bar (I have already got the nav bar below the header with custom_functions.php) using a simple code like:
Now, I put this code in the css stylsheet through the wp dashboard (and I did change the image location) but thesis just seem to ignore it. Any idea on what did I do wrong?

I would appreciate any help here.

btw, I did managed to add a header using the custom_fucntions.php or the thesis openhook plugin but I can't style the padding and other stuff if it's not done through the CSS stylesheet.

The first thing I would do is clear your browser cache to make sure it's not caching your stylesheet. If nothing changes, then reply and I can help you further.

First of all thanks for your reply, I managed to solve it with a code that I found on another site.

You can close the thread now.