Adding a CSS class to the 1st occurance of an element?

Adding a CSS class to the 1st occurance of an element?

Hi,

Is it possible to adding a CSS class to the 1st occurance of an element on a page? I have a list of lines like this:
<div class="theline"><a href=page.html"></a></div>
<div class="theline"><a href=page.html"></a></div>
<div class="theline"><a href=page.html"></a></div>
<div class="theline"><a href=page.html"></a></div>

Is is possible to add a CSS class (class="myclass") to just the first occurance of the above lines of code using Jquery?

Thanks in advance