STEP 1

In the head of the same page within which the full source of the form has been embedded, add the following script:

<script type="text/javascript">
function totalx2()
{
a = document.form_12621934763.q1_whatI.value
b = document.form_12621934763.q3_myExpanded.value
 
c = (a * 2) + (b * 2)
 
document.form_12621934763.q4_myTwo.value = c.toFixed(2);
}
</script>


STEP 2

Search for the following in the form's source that's embedded in the page:

<input type="text" class="form-textbox" id="input_4" name="q4_myTwo" size="15" />

and change it to this:

<input type="text" class="form-textbox" id="input_4" name="q4_myTwo" size="15" onfocus="totalx2();" />


STEP 3

Save the change