jQuery(document).ready(function($) {
  $('#navigation ul li a:first').css({"border-left":"none"});
  $('#navigation ul li').hover(
    function () {
      if ( $(this).children('ul.children') ) {
        $(this).children('ul.children').slideDown(100);
      }
    },
    function () {
      if ( $(this).children('ul.children') ) {
        $(this).children('ul.children').slideUp(100);
      }
    }  
  );
});