[princem131]

I haven't used the stock sms in a while so i cant remember if this can be changed easily, however try downloading Handcent (or another 3rd party text app) from the market. Handcent has much more control over its functionality and you should be able to set it where no preview is displayed.

Just make sure to turn off the receive sms and notifications in stock sms and set handcent as default

edit: Kbussen you just beat me to it while i switched form my hero to my laptop!

But yeah yeah dude switch to handcent