Delegate for jQuery 1.3.2

estrar

I got this code today that works for jQuery v7. The problem is that it need to work for 1.3.2 as well. How would I translate it?

$(document).ready(function() {
    $("ul#dropdown li ul").hide(); 
    $("ul#dropdown").delegate( 'li', 'click', function () {   
    if (!$(this).parent().is("ul#dropdown") ) {
            return false; 
        }  
    $(this).siblings('.' + "current").removeClass("current").children('ul').slideUp('fast');
    $(this).addClass("current").children('ul').slideDown('fast')
    });
});