用javascript实时计算文本框累加值

想利用javascript对文本框的onchange, 计算下面源代码中所有名称为Number_<% = i %>的文本框的累加值,并实时显示在Total_Number中,谢谢!ASP源代码:<form name="form1" method="post" action=""><%for i = 1 to rs.RecordCount%> <% =i %> <input type="text" name="Number_<% =i %>" value="<% =rs("MyNumber") %>"><br><% Total_MyNumber = Total_MyNumber + rs("MyNumber") rs.MoveNextNext%>TOTAL <input type="text" name="TotalNumber" value="<% =Total_MyNumber %>"></form>