First link is an example of mouseover and mouseout. Second link is an example of mouseenter and mouseleave. Hover over the link to see effect. My general blog Tech blog

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The demo is part of this article on mouseover, mouseout, mouseenter and mouseleave(http://www.satya-weblog.com/2012/01/learn-yui3-mouseover-mouseout-mouseenter-mouseleave-events-examples.html). I could not use the link here as second example is based in attribute selector for Not having Rel=me. In that case, this link would have got selected.