how to add three condition at Jquery
<p>I want to use three condtions in my <code>if</code> statement. Here is my code:</p>

<pre><code>&lt;script&gt;
    jQuery(document).ready(function() {
        var num_one; var num_two; var num_three;
        $("#control").attr("disabled", "disabled");

        $('#col-1 li').click(function(){  num_one = true;  getState();});
        $('#col-2 li').click(function(){  num_two = true; getState();});
        $('#col-3 li').click(function(){  num_three = true; getState();});

        function getState(){
            if ((num_one == true) &amp; (num_two == true) &amp; (num_three == true)) {
                $("#control").removeAttr("disabled");
            }
        }

        /*$('#col-1 li').click(function(){$("#control").removeAttr("disabled");*/
    });

    /**$("#enableBtn").click(function() {
        $("#clearBtn").removeAttr("disabled");
    });**/
&lt;/script&gt;
</code></pre>

<p>It was working when I used just two conditions:  <code>if ((num_one == true) &amp; (num_two == true))</code> but when I add a third condition it does not work. How can I add three conditions together in an if statement?</p>
