add values

[searls03]

ok, how would I go about adding values from a multiple text fields, and the same text field multiple times?  like text field1 has value of 5 first time, then it submits without any refresh, then it will contain 10 next.  then text field 2 has 5, so then the total is 20.  Then when that total is reached, a div will refresh.  I am new to javascript, please help.