insertHTML Dosen't Always Work? Why?

Hi,

Im using insertHTML to quote posts on my forums. It works for half the posts but not all. Any ideas why?

for example, this dosent work:

<input id="quote" onclick="InsertHTML('\[quote\]<strong>Quoting kyokouzuma</strong>\[br\]<p>i downloaded Naruto Shippuden 3D- The New Era and it didn't work either</p>\[/quote\]');" type="image" src="/images/quote.png" width="50" height="11" value="Insert Text" />

This does work:

<input id="quote" onclick="InsertHTML('\[quote\]<strong>Quoting ruben9898</strong>\[br\]<p>So there is basically no point for downoading 3ds roms right now?</p>\[/quote\]');" type="image" src="/images/quote.png" width="50" height="11" value="Insert Text" />

Any ideas why its doing this ?