<div id="advancedsearch" class="advancedsearch">
<p>Document Properties:</p>
<form>

<p><input type="radio" name="cat" value="and" /> match <span class="all">ALL</span> of these |
<input type="radio" name="cat" value="or" />match <span class="any">ANY</span> of these
</p>
<div id="dropdown">
<select id="tags" name="tags" class="tags">
<option value="tags" selected="selected">tags</option>
<option value="agent">agent</option>
<option value="extension">extension</option>
<option value="fileversion" >fileversion</option>
<option value="pages">pages</option>
<option value="object">object</option>
<option value="path">path</option>
<option value="variant">variant</option>
<option value="bad">bad</option>
<option value="complex">complex</option>
<option value="encrypted">encrypted</option>
<option value="escherpropname">escherpropname</option>
<option value="escherpropnumber">escherpropnumber</option>
<option value="escherrecordname">escherecordname</option>
<option value="escherrecordnumber">eshcerrecordnumber</option>
<option value="eschershapename">eschershapename</option>
<option value="eschershapenumber">eschershapenumber</option>
<option value="mswordpicturetype">mswordpicturetype</option>
<option value="functionuse">functionuse</option>
<option value="objects">objects</option>
<option value="heightpixels">heightpixels</option>
<option value="widthpixels">widthpixels</option>
<option value="maxrecordsize">maxrecordsize</option>
<option value="encoding">encoding</option>
<option value="dpi">dpi</option>
<option value="depth">depth</option>
<option value="mask">mask</option>
<option value="progressive">progressive</option>
<option value="colour">colour</option>
</select>

<select id="operands" name="operands" class="operands">
    <option>operands</option>
  </select>

<select id="values" name="values" class="values">
    <option>values</option>
  </select>

<input type="button" value=" + " onclick="addNew();">
<input type="button" value=" - " onclick="this.parentNode.parentNode.removeChild(this.parentNode);">

</div>

<script type="text/javascript">
    function addNew() {
    var cloned = $('#dropdown').clone();
    cloned.appendTo("#advancedsearch")
    };
</script>

</form>
</div>