<U>NN 3   IE 3   HTML 3.2
<U>...</U>End Tag: Required
 

The U element renders its content as underlined text. This element is deprecated in HTML 4.0 in favor of the text-decoration:underline style sheet attribute.

 
Example 
<P>You may already be a <U>winner</U>!</P>
 
Object Model Reference
IE [window.]document.all.elementID
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