Peek-a-boo Bug in IE6 and the possible solutions
When we design a liquid layout, the more common case of this bug appearing in pages will be when you design a <div> layer next to another <div> layer each set to float. It occurs in IE6 and is taken care of in IE7.
Another variant of this bug hidng of border or content, when a mouse over happens over hyperlinks or over the containing layer as such.
Various solutions are available for this problem. One of them involves giving a line-height for the element and the other being setting the layout position relative to its container. Another solution involves giving an empty layout element with a comment within the div layer. Also you can try giving the div layer in question a height
