Get value from combobox and add a number to it
<p>I am trying to get the "value" from a combo box and simply add one to it. I think I need to convert it to a integer but can't make parse work either. Next I want to put that new number into a text box.</p>

<pre><code>&lt;script type="text/javascript"&gt;
    function GetNextCategoryNum(sel)
    {
        var NextNumber; 
        var number = sel.options[sel.selectedIndex].value; 
        NextNumber = number ++1;
        alert("Last number used "  + number );
        textbox = NextNumber 
    }
&lt;/script&gt;
</code></pre>
