How to make automatically check radiobutton?

How to make automatically check radiobutton?

How to make automatically check radiobutton with jquery if another radiobutton selected?

In this case - if   Cash od delivery selected - then Surcharge 10$ is automatically selected
(mean if user want make order with option cash on delivery, must pay more money)

Idea could be with validation if one is selected one coma ona or one coma two must be selected?

Please help how to code it...




  1. <form>
  2.   <input type=hidden name=todo value=post>
  3.   <div>
  4.     <p>Delivery:</p>
  5.     <input type=radio name=sex value='ups' id="ups">
  6.     UPS Courier <br>
  7.     <input type=radio name=sex value='surcharge' id="surcharge">
  8.     + Surcharge 10$ if cash on delivery</div>
  9.   <div>
  10.     <p>Payment:</p>
  11.     <input type=radio name=sex value='cashondelivery' id="cashondelivery">
  12.     <span id="search">Cash on delivery</span><br>
  13.     <input type=radio name=sex value='banktransfer' id="banktransfer">
  14.     Bank Transfer </div>
  15.   <input name="submit" type=submit value="Save">
  16. </form>