How to add style for every first list element, first children with jQuery

djlukas777

I have this markup:

<ul>
  <li> // this
    <ul>
      <li>
        <div></div>
      </li>
      <li>
        <div></div>
      </li>
    </ul>
  </li>
  <li> // this
    <ul>
      <li>
        <div></div>
      </li>
      <li>
        <div></div>
      </li>
    </ul>
  </li>
</ul>

In my style i have this:

.main_menu ul > li {
   // some style
}

and that gives me some style for only first li in that tree, not for children li of it.
So, my question is how to set this with jQuery, when i’m trying with $('.main_menu ul > li'); it doesn’t work. I guess i need some kind of this write:

$('.main_menu ul').each().first().child();

but it’s not correctly, can you help me?