Radio button uncheck on second click

I have a LOT of radio buttons that grab a value from my database and if it is set to "1", I make the radio button checked.

If a radio button is checked, and a user clicks on it again, I still want to be able to clear this button. Does anyone have an idea?

$radio1 grabs data from database and will be either 0, 1, or 2

<input value="1" name="radio1" type="radio"<?php if($radio1==1){echo " checked";} ?>>
<input value="2" name="radio2" type="radio"<?php if($radio1==2){echo " checked";} ?>>

Varun Malhotra's Answer slightly modified: I changed 2 lines of code that worked a little better for me. But overall, Varun's answer was PERFECT!

$('input[type="radio"]').click(function(){
    var $radio = $(this);

    // if this was previously checked
    if ($radio.data('waschecked') == true)
    {
        $radio.prop('checked', false);
        $radio.data('waschecked', false);
    }
    else
    {
         $radio.prop('checked', true);
         $radio.data('waschecked', true);
    }

    // remove was checked from other radios
    $radio.siblings('input[type="radio"]').data('waschecked', false);
});