[TYPO3-rte] adding own classes to bullet list

[Siddhesh]

Hello list,
I want to add a class to bullet list.When i select bullet list.I get a 
html some what like this
<ul>
<li></li>
<li></li>
<ul>

But i want something like this to happen when i select bullet list
<ul class="myownclass">
<li></li>
<li></li>
</ul>

Any one can please help me..I am new to this

Thanks in advance