Cool DHTML Tooltip and drop down menus

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1) Script Title: Cool DHTML Tooltip

2) Script URL (on DD): www.dynamicdrive,com/dynamicindex5/dhtmltooltip.htm

3) Describe problem: On a clean page without influence of other scripts I notice that the message box is hidden behind any dropdown menu which corresponds with the same space as the message box. ie. a dropdown menu shows through the message box making message difficult to read. Perhaps just a tweaking is necessary but I can't see where. Any help? :(

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Sorry, did that the wrong way round. Just found a similar comment re this problem in an earlier thread.

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By the way, there's no layer that will cover those dropdowns in IE whatever you set the z-index to(and so mask them for the Tooltip) as suggested in the previous thread on this.