multiple rows with a single UL

Question

I have following:

<ul>
<li>copy</li>
<li>copy</li>
<li>copy</li>
<li>copy</li>
<li>copy</li>
<li>copy</li>
<li>copy</li>
<li>copy</li>
... 50 rows...
<ul>

I have a very long UL list, is there a sexy way I can split it to be 2 or 3 rows using CSS?? I cannot make multiple <ul>'s unfortunately.. :(

Thankful for any type of help.