I would suggest posting images via imageshack.us. It stores them on their site and provides you with automatic thumbnail images and code that you can copy/paste directly onto your post here. Storage is permanent and the size limits are far beyond what the forum itself imposes.
My trading post thread is a prime example.
And if you still want to resize a photo, I would recommend an image editing program such as Adobe Photoshop.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.