check radio button1 when checkbox is checked?

Question

Hi every one,

i need code for, when i check checkbox , automatically radiobutton1 checked.
i,e i have one checkbox and 4 radio buttons, if i check on checkbox automatically check the radio button1, and if i uncheck the check box automatically uncheck radio button1,
this is my requirement, pls tell me the procedu to fullfill this task.

thanks in advance.