JQuery: Ensure that at least one checkbox is selected

function setHiddenAction(element) {
    var okToSubmit = false;
    //A. Make sure that the user selects at least one item before they Request an Action
    if( $("input:checkbox:checked").length > 0 ) okToSubmit = true;
    //B. Set the Hidden Value to the Users Requested Action
    $("#action").attr("value", element.value)
    //C. Either Submit or give an Error Message
    if( okToSubmit ) {
        $("form").submit();
    } else {
        alert( "Please select at least one item" );
    }
}
 
setHiddenAction("email");