function showAllBoxes(){
                var inputs = getBoxes(window)
                for (var i =  0 ; i < inputs.length; i++) {
                    if (inputs[i].type == "checkbox") {
                        document.getElementById("types").innerHTML += "<br/>" + inputs[i].type;
                    }                    
                }
            }

            function getBoxes(wnd){
                var result = []
                var inputs = wnd.document.getElementsByTagName("input");
                for (var i =  0 ; i < inputs.length; i++) {
                    if (inputs[i].type == "checkbox") {
                        result[result.length] = inputs[i]
                    }
                }                
                for (var i =  0 ; i < wnd.frames.length; i++){                    
                    result = result.concat(getBoxes(wnd.frames[i]))
                }
                return result
            }