Horizontal Scroll Bar Problem | Comments

For some reason or another, when someone goes to type a comment, a horizontal scroll bar appears at the bottom of the screen. There is no bar on the index.php page, just when the comments linked is clicked.
I thought that it might be the fact that the <textarea> column width was too large, the right side wasn’t visible on the page. But when I changed the width of the columns so it’d fit on the page, the bar still appeared. Anybody else have that problem…I can’t stand horizontal scroll bars.
Thanks for any help!