Not 100% sure what you mean by "line splitter". Are you asking for putting a line between 2 menu items? If so, you could hard code some CSS to do that....
Code:
<li><a href="">Some menu item before split</a></li>
<li class="line"></li>
<li><a href="">Some items after split</a></li>
...
then in CSS something like:
Code:
li.line {
background-color:#000;
height:2px;
}
Of course, this is only one method. There are other ways to make lines.