Alan,
Please following the steps below:
1. Open tag_a.aspx, gecko_tag_a.aspx and safari_tag_a.aspx.
2. Find the following code:
<input type="text" id="inp_src" style="width:260px">
Change it to
<input type="hiddent" id="inp_src" style="width:260px">
3. In your dropdown list, add an onchange event to update this hidden field based the selection.
For example:
<select onchange="sel_change()">
</select>
<script>
function sel_change() { }
</script>
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