[Typo3] cannot change border to 1 for beforeImg?

[Bing Du]

Even though with border=1 set in beforeImgTagParams as shown below:

beforeImg =  {$menu.file.bullet}
beforeROImg = {$menu.file.bullet_RO}
beforeImgTagParams = hspace=2 border=1

the HTML typo3 returned shows:

<img src="media/bullets/bullet1_n.gif" width="9" height="9" 
name="img8_7f6b_0before" hspace=2 border=1 border="0" alt="" />

Why is border="0" still there?

As always thanks in advance for any help.

Bing