SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by forgetcolor

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<input id="cb1" type="checkbox" />
<input id="cb2" type="checkbox" />
<input id="cb3" type="checkbox" />

JavaScript

/*
jQuery('input:checkbox:not(input#selectAll)').click(function(){
   alert("clicked");
}); 


$('input:checkbox').click(function() {
    alert("clicked");
});

        if($('#foo').is(':checked')){
    alert($(this).val());
*/

//$('#cb1').click(function() {

$('input:checkbox').click(function() {
    if($('#cb1').is(':checked')) {
        $('#cb2').removeAttr("checked");
        //alert("checked");
    } else {
        //alert("unchecked");
        $('#cb2').attr("checked","checked");
    }
    

});