Find white pixel

[youngnoviceinneedofh]

Hi, I have an image which is a red background, with a white box on top.
I need to know the coordinates of that most top left white pixel.
My idea is to use a screen grabber - the one in the link below,
http://www.vbforums.com/showthread.php?t=411508

And the picture comparer attached, modify them both slightly, so that i can grab an area that i know covers the white pixel, then use the pic comparer to find the white pixel, and when it does, tell me in a text box the x an y coordinates of it.

If anyone thinks they have a moment to try and do this ( or something similar - i can see the pic comparer not being the right method) I would be very grateful, and big rate points coming...

Thanks
Very much
Alex