Hi Steve,
You should set position:fixed to the div, and adjust the top and left properties - as you did.
Also you can take a look at the RadToolTip control. Here it is a simple example which illustrates a similar behavior:
http://demos.telerik.com/aspnet-ajax/tooltip/examples/relativeto/defaultcs.aspx
All the best,
Petio Petkov
the Telerik team
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