Below, removing the 't' from the input name, cause button click to change to 'INPUT'
<form name="f1">
<input type="text" id="foo" name="uhuh" value="66" />
<input type="text" name="thesellt"
onchange="alert($.inArray(this, document['f1']['thesell'])!=-1);"
/>
<select name="thesell"><option value="1">one</option>
<option value="2">two</option>
</select>
<input type="text" name="farr" value="33"/>
<button onclick="alert(document['f1']['thesell'].length +document['f1']['thesell'][0].tagName
);return false;">clikme</button>
</form>gt;one
