QuentinKshitij Saxena -KJ-提出了一个问题：Changing a CSS rule-set from Javascript，或许与您遇到的问题类似。
回答者CommunityAlex Gyoshev给出了该问题的处理方式：
You can, but it's rather cumbersome. The best reference on how to do it is the following article: Totally Pwn CSS with Javascript (web archive link).
I managed to get it to work with Firefox and IE - <del>I couldn't in Chrome, though it appears that it supports the DOM methods.</del>ricosrealm reports that it works in Chrome, too.
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