On line 96 of addproducts.ascx you will see the following line of code that sets the width:

<table align="left" class="SmithProdText" width="1060px">

This width is wide enough so the menu doesnt wrap and has been set at 1060px for sometime. You can try increasing it to 1200 or something wider but whats most likely happening is the page width set in your skin.css is overriding this.

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At your service,
Dave Smith

\desktopmodules\smith.buynow

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At your service,
Dave Smith

Keep in mind, all ye webmasters, that many computers are only running 1024x768 resolution; and if it's an older person, they may have it set at 800x600.

Remember to check your pages at different resolutions, and with different browsers (Firefox, IE, Opera, Chrome) to make sure that things are working the way you want them to across the board.