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Javascript Calculation

Hello,

I have a or with a number of input options -

<form action="" method="post" name="form1" id="form1" onsubmit="return validateform1(this)">
<h3>Complete Survey Now</h3>
<ul>
    <li>
      <label>Retainer Value :</label>
      <input name="Locality" type="hidden" id="Locality" value="<%=(RSMemberLocality.Fields.Item("Locality").Value)%>" />        <input name="Retainerinput" type="hidden" id="Retainerinput" value="yes" />        
      <input name="RetainerValue" type="text" id="RetainerValue" maxlength="8" onBlur="this.value = formatField(this)" />
      </li>
    <li>
      <label>Fee Commission :</label>
      <input name="FeeCommission" type="text" id="FeeCommission" maxlength="8" onBlur="this.value = formatField(this)" />
      </li>
    <li>
      <label>Total :</label>
      <input name="TotalRetainer" type="text" id="TotalRetainer" maxlength="8" onBlur="this.value = formatField(this)" />
      </li>
    <li>
      <label>Date of Review </label>
      <input type="text" id="ReviewDate" name="ReviewDate" />

      </li>
    <li>
      <label>Comments</label>
      <div class="retainerholdertextarea"><textarea name="Comments" cols="36" rows="5" id="Comments"></textarea></div>
      <input type="image" class="submitbutton" src="png/submit.png">
      </li>
</ul>
</form>

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I would like it if

TotalRetainer was a calculated value based on the input into either or both of -

RetainerValue
FeeCommission

So if only FeeCommision is entered the value in TotalRetainer is the same as the value in FeeCommission, OR if both are entered the value is the Sum of both.

The calculation needs to happen on blur of either input.

And nost importantly, the input needsto be updateable, so if the sum of both is 10, but more parameters are involved and the actual total is 12, the user can over write the javascript calculated value...

Appreciate any help you can offer - Many thanks

garethtnash

ASKER

Hi - slight update -

I've tried -

<script>

</script>

AND

<td><input name="Locality" type="hidden" id="Locality" value="<%=(RSMemberLocality.Fields.Item("Locality").Value)%>" /> <input name="Retainerinput" type="hidden" id="Retainerinput" value="yes" />
<input name="RetainerValue" type="text" id="RetainerValue" maxlength="8" onBlur="this.value = formatField(this);calc('one','two','TotalRetainer')" /></td>
</tr>
<tr class="altrow">
<td class="labelcolumn">Fee Commission :</td>
<td><input name="FeeCommission" type="text" id="FeeCommission" maxlength="8" onBlur="this.value = formatField(this);calc('one','two','TotalRetainer')" /></td>
</tr>
<tr>
<td class="labelcolumn">Total :</td>
<td><input name="TotalRetainer" type="text" id="TotalRetainer" maxlength="8" onBlur="this.value = formatField(this)" /></td>

But no joy -

Thanks

ASKER CERTIFIED SOLUTION