How to enable html:text on some condition

HI,
I am trying to enable and disable a text field on clicking radio buttons. I am able to disble the form, but I am not able to enable it back.
<TD>
<INPUT type="radio" name="radPreYesNo" value="Y"
onClick='javascript:document.Page3Form.txtYesNo2.value="Y",
document.Page3Form.agr_num.disabled= "false"'>Y
<INPUT type="radio" name="radPreYesNo" value="N"
onClick='javascript:document.Page3Form.txtYesNo2.value="N",
document.Page3Form.agr_num.disabled= "true"'>N
</TD>
This is the text field that I want to make editable..
<TD width="20%" align="right">Agreement Number</TD>
<TD width="20%"><html:text property="agr_num" maxlength="20"
style="width:100px;border:none" />
</TD>
Thanks for any help in advance..
Johnson

HI ,
I found what was wrong ;o) The problem was the quotes ( " " ) for false.
When I say
'document.Page3Form.agr_num.disabled= "true"'>
When the value for disabled is anything other than false, the text field is disabled. When I gave
'document.Page3Form.agr_num.disabled= true'>
it worked.
:o)

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