Required library edition:
Required library file: dhtmlxmenu.js

attaches an event handler

• original - event's original name;
• catcher - event handler;
• CallObj - object that will call the event.

Several handlers can be attached to one and the same event, and all of them will be executed.

Note: the names of the events are case-insensitive.

    menu.attachEvent("onClick", function(id){
        // code here
    });
    // or
    function doOnClick(){
        // code here
    }
    menu.attachEvent("onClick", doOnClick);