radio buttons

hi, 

i am creating a website which requires a page that will allow the customer to customise a PC. Once the options have been selected i would like to: 

a) update the total cost of the pc based on the requirements. I don't know if the update is possible on the fly, i.e. as soon as the customer clicks a radio button the total is updated... although for now i don't mind having to click an update total button and displaying the new total on the same page. 

b) email the requirements to myself. 

I have so far created the radio buttons... same name different values etc.. and am trying to use a switch statement to test the value of the radio group. I'm not where to do the test and how to keep the selected radio buttons selected after submitting the form to itself... instead of resetting to default. 

any help!

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paste your code here

paste your php code here, of what you have done so far.

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