Radio button clears and disables text field

[sauerma]

have 5 radio buttons and 1 text field. 4 radio buttons have different money value and the text field is a fill in.

I am wanting to clear and disable the text field and its radio button when a different radio button is chosen. Here is the code I am using.
<tr>
<td>
<input name="OPS" type=radio value="15.00" checked /></td>
<td>$15.00 </td>
</tr>
<tr>
<td width="5%">
<input type=radio name="OPS" value="25.00" /></td>
<td width="95%"> $25.00 </td>
</tr>
<tr>
<td width="5%">
<input type=radio name="OPS" value="50.00" /></td>
<td width="95%">$50.00 </td>
</tr>
<tr>
<td width="5%">
<input type=radio name="OPS" value="75.00" /></td>
<td width="95%">$75.00 </td>
</tr>
<tr>
<td width="5%">
<input name="OPS" type=radio value="opsmoney" / ></td>
<td width="95%"><b>$</b>
<input name="opsmoney" type=text id="opsmoney" size="20" / >
</td>
</tr>

Any help would be appreciated.
Thanks

[MrNobody]

Here is the change to your HTML:

<tr>
  <td>
    <input type="radio" name="OPS" value="15.00"
     onclick="return HandleRadioOtherBox(OPS, opsmoney)" /></td>
  <td>$15.00 </td>
</tr>
<tr>
  <td width="5&#37;">
    <input type="radio" name="OPS" value="25.00"
     onclick="return HandleRadioOtherBox(OPS, opsmoney)" /></td>
  <td width="95%"> $25.00 </td>
</tr>
<tr>
  <td width="5%">
    <input type="radio" name="OPS" value="50.00"
     onclick="return HandleRadioOtherBox(OPS, opsmoney)" /></td>
  <td width="95%">$50.00 </td>
</tr>
<tr>
  <td width="5%">
    <input type="radio" name="OPS" value="75.00"
     onclick="return HandleRadioOtherBox(OPS, opsmoney)" /></td>
  <td width="95%">$75.00 </td>
</tr>
<tr>
  <td width="5%">
    <input type="radio" name="OPS" value="opsmoney"
     onclick="return HandleRadioOtherBox(OPS, opsmoney)" /></td>
  <td width="95%"><b>$</b>
    <input name="opsmoney" type=text id="opsmoney" size="20" / ></td>
</tr>

and here is the JavaScript code:

function HandleRadioOtherBox(grp, txt)
{
	var x, len = grp.length;
	for (x=0; x<len; ++x)
	{
		if (grp[x].checked) break;
	}
	if (x < len && grp[x].value == txt.name)
	{
		txt.disabled = false;
		txt.select();
		txt.focus();
	}
	else
	{
		txt.value = "";
		txt.disabled = true;
	}
	return true;
}
window.onload = function()
{
	var ele = document.forms[0].elements;
	return HandleRadioOtherBox(ele['OPS'], ele['opsmoney']);
}