how to disable <a href

[selvialagar]

i have link like this...

<a href="javascrip t:showCal('Cale ndar2')">Select Date</a>


i have a radio button named 'rent'.
now i want to disable this link....but it should be enable when i click the radio button....is it possible....plz give some ideas...

[drhowarddrfine]

Perhaps with javascript but you would need to ask on that board.