On a credit card transaction form for donations I have a field for donation and a check box for "Break my donation into 12 payments".
So if this check box is checked I'd like to divide the donation by 12 and enter it into the totalcharge field. If it is not checked then the total amount they entered will go into the totalcharge field.
I have had some luck doing similar manipulation in the past with jquery but I am struggling a bit with this one.
Any suggestions will be greatly appreciated.