// Checkbox manipulation function from http://docs.jquery.com/Tutorials:Getting_Started_with_jQuery
// assumed to be under the same license as jQuery itself: MIT or GPLv2
jQuery.fn.check = function(mode) {
    // if mode is undefined, use 'on' as default
    var mode = mode || 'on';
    return this.each(function() {
	switch(mode) {
	case 'on':
	    this.checked = true;
	    break;
	case 'off':
	    this.checked = false;
	    break;
	case 'toggle':
	    this.checked = !this.checked;
	    break;
	}
    });
};