Checkbox = {
    getValue: function(id) {
        var result = "";
        var coll = document.getElementsByName(id); 
        if(coll != undefined && coll != null){
            for(var i=0; i<coll.length; i++){
                if(coll[i].checked){
                    result = result + coll[i].value + ",";
                }
            }
            result = result.substring(0, result.length-1);
        }
        return result;
    },
    check: function(id) {
        var coll = document.getElementsByName(id); 
        if(coll != undefined && coll != null) {
            for(var i=0; i<coll.length; i++) {
                if(!coll[i].disabled){
                    coll[i].checked = true;
                }
            }
         }
    },
    uncheck: function(id) {
        var coll = document.getElementsByName(id); 
        if(coll != undefined && coll != null) {
            for(var i=0; i<coll.length; i++) {
                coll[i].checked = false;
            }
         }
    }
};