Using Firebug (Firefox) or web inspector (Chrome, Safari) will help you find any elements styling, and show what needs to be edited:
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If you're using IE8/9 then f12 brings up the developers tools, where you can select the pointer tool, then click on an element on the page to see it's css.
In this case, find the element and add to your css:
.whateverElementClass { display: none; }