What you're looking for (and using) isn't a static texture/image. It's found in the mpq files amongst the skins and texture files of npcs, objects, spells, etc.
You can browse for it here:
http://www.wowinterface.com/download...delViewer.html
Or... you can find the icon texture itself (rather than the portal image) here:
http://wowprogramming.com/utils/artb...nterface/ICONS
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh