It depends on whether or not they are using UBB Code. If they are using UBB code, then a new window will open for the URL.
If they are using HTML, a new window will not open (unless they use the TARGET="_blank" qualifier, but I don't think anyone here does that besides me).
Check out the UBBCode section of the FAQ for more information on how to use UBB Code
Hope this helps
Spark
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Kevin Jon Schlossberg
SysOp and Administrator for BladeForums.com
www.bladeforums.com