I would like to have a form button disabled, until a user clicks a checkbox.

This is the code i have (last part of the form)

<div class=checkbox>

    <input id=check name=checkbox type=checkbox>

    <label for=checkbox>

      Some Text Here

    </label>

  </div>

  <input type=submit name=anmelden class=button id=btncheck value=Send />

I tried the following

$('#check').click(function(){



if($(this).attr('checked') == false){

     $('#btncheck').attr(disabled,disabled);   

}

else

    $('#btncheck').removeAttr('disabled');

});

But this is not working and I am not sure why. I don't know how I can disable the button (should be disabled also visually).

Solution (thanks to Rory McCrossan): http://jsfiddle.net/0hvtgveh/