SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by TJ VanToll

HTML

<link href="http://code.jquery.com/ui/jquery-ui-git.css" rel="stylesheet" />
<script src="http://code.jquery.com/ui/jquery-ui-git.js"></script>

<div id="otherReccuranceDiv">
    <b><label for="otherRec">Other Reccurance</label></b>
    <input name="otherRec" id="otherRec" type="checkbox">
    <div id="othrRecDates" style="display: none;">
        <b>Date:</b>
        <input name="othrRdate" id="date" type="text">
        <br>
    </div>
</div>
<button id="otherRecAdd" type="button">Add Row</button>

JavaScript

var dc=0;
jQuery('#otherRecAdd').click(function() {
    dc++;
    jQuery('#othrRecDates').clone().attr('id', 'othrDate'+dc).show()
      .appendTo('#otherReccuranceDiv')
      .find('input').attr('id', 'orDate'+dc).datepicker();
});