Event affecting all items

Event affecting all items

I´m wondering why this jquery-code causes all list-items to receive my css.

This is my html source:
<body>
<ul>
  <li id="eins">Test</li>
  <ul>
    <li>Test2</li>
    <li>Test3</li>   
  </ul>
</ul>
</body>


And this is my jquery
$(document).ready(function() {   
    $("li#eins").css("cursor", "pointer");
    $("ul").css("list-style-type", "none");
});


I only want to assign the css (cursor, pointer) to list item with id=eins.

In FF (2,3) it works.
But in IE (6,7) the css is assigned to all elements.
Why?