[jQuery] Bug in jquery related to text elements?

[jQuery] Bug in jquery related to text elements?

Hi,
Is anyone familiar with a bug in JQuery where including the "jquery.js" library on your page seems to disassociate text elements from their parent forms? This is the text element I have that no longer recognizes its parent form when I call "alert(document.getElementById('PM16033-1497').form.name);". I get a JS error, "document.getElementById ... .form has no properties".
<input onChange="if (this.value != '') {isValidQty(this)};" type="text" size="4" name="PM16033-1497" id="PM16033-1497" value="">
Thanks, -
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