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There are a lot of online tutorials regarding this aspect of Javascript, especially in the area of DHTML menus. I personally try not to use the things (it's all about pure CSS menus, which are structured way better and make up for just about all of JS's shortcomings), but I've read some pretty informative and interesting stuff about JS and they include extensive coverage of event handlers like onMouseOut. I'd recommend reading some of that if you're into Javascript.
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