ASP with Javascript calculation

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   What I am trying to work on is about calculation. (refer to attchment -  http://www.htmlforums.com/attachment.php?s=&postid=19808 9). The price is readonly but the quantity is changable. What I want is the total colum will automatically calculate (price * quantity) with onchange of quantity textbox. Meaning when there is any changes of quantity texbox's value, then total column value will automatically calculated.

My existing code is below but I wonder if this way works:

function calculate()
{
tempquantity = document.myform.quantity_fr.value;
tempprice = document.myform.price_fr.value;
temptotal = tempquantity * tempprice; 
}
document.myform.total_fr.value = temptotal
}

<% 
DO WHILE NOT rs.eof
response.Write "<tr valign=top><td>" & rs("pName") & "</td>"
response.write "<td nowrap>" & rs("PCategory") & " </td>"
response.write "<td nowrap>" & rs("PType") & " </td>"
response.write "<td nowrap align=right><input type=text name=price_fr size=5 readonly value=" & rs("PPrice") & "> </td>"
response.Write "<td nowrap><input type=text name=quantity_fr size=5 maxlength=6 value=" & rs("quantity") & " onChange='calculate();'></td>"
response.write "<td nowrap align=right><input type=text name=total_fr size=5 readonly></td>" 
response.write "<td><input type=hidden name='productID_fr' value=" & rs("RDetails.ProductID") & "></td></tr>" 
strGrandTotal = cdbl(strGrandTotal) + cdbl(strTotal) 
rs.MoveNext
LOOP 
response.write "<tr><td colspan=6 align=right bgcolor=orange><b>Grand Total = " & FormatNumber(strGrandTotal,2) & "</b></td></tr>"
%>