okay here is the situation:
I have a forum with 3 radio buttons,
2 text fields and a button. I want to enter a number in the first text field and if the first radio button is checked is will mutiply by 5 if the second is check subbstact by five and if the third is checked add 5 and write it in the second text field. now here is where it gets tricky, if the valu in the first text field is below 10 i want it to say 15 in the second text field no matter what.

thanks in advance