IE textarea width changes when user types some text

I have a page in which there are a few textarea and <input type="text"> html controls. These elements are placed in a div tag:

In IE 7 after the user types some text in textarea, the width of the textarea changes on its own:

and now again if the user types some text in the textbox, the textarea agian returns to its original width:

Has anyone faced any similar issues?

From stackoverflow

• Set a width in px, for the textfields. Should resolve the expanding behaviour.

  dalbaeb : This does, indeed, work.

  Peter Perháč : wish there was a better way though. it works but... ahhhh the aggravation, making things work in ie6