Help on making an auction

I've been having troubles to put up an auction with pictures of the Items I have. But unfortunately everytime i try to post pictures up for the auction, i tried to attach it to the post, but it keeps saying the file is too big. And all i did was cut out the description of the item/weapon.
I need my Auction to look more like this:
http://www.guildwarsguru.com/forum/s...ad.php?t=85967
[[ that auction is still active ]]

Please help with a quick post or PM me ..

Thankssss

Save it as .jpg, .gif, or .png, not as .bmp.