shortcut = { 'all_shortcuts': {}, 'add': function(shortcut_combination, callback, opt) {
    var default_options = { 'type': 'keydown', 'propagate': false, 'disable_in_input': false, 'target': document, 'keycode': false }
    if (!opt) opt = default_options; else { for (var dfo in default_options) { if (typeof opt[dfo] == 'undefined') opt[dfo] = default_options[dfo]; } }
    var ele = opt.target; if (typeof opt.target == 'string') ele = document.getElementById(opt.target); var ths = this; shortcut_combination = shortcut_combination.toLowerCase(); var func = function(e) {
        e = e || window.event; if (opt['disable_in_input']) { var element; if (e.target) element = e.target; else if (e.srcElement) element = e.srcElement; if (element.nodeType == 3) element = element.parentNode; if (element.tagName == 'INPUT' || element.tagName == 'TEXTAREA') return; }
        if (e.keyCode) code = e.keyCode; else if (e.which) code = e.which; var character = String.fromCharCode(code).toLowerCase(); if (code == 188) character = ","; if (code == 190) character = "."; var keys = shortcut_combination.split("+"); var kp = 0; var shift_nums = { "`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&", "8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ":", "'": "\"", ",": "<", ".": ">", "/": "?", "\\": "|" }
        var special_keys = { 'esc': 27, 'escape': 27, 'tab': 9, 'space': 32, 'return': 13, 'enter': 13, 'backspace': 8, 'scrolllock': 145, 'scroll_lock': 145, 'scroll': 145, 'capslock': 20, 'caps_lock': 20, 'caps': 20, 'numlock': 144, 'num_lock': 144, 'num': 144, 'pause': 19, 'break': 19, 'insert': 45, 'home': 36, 'delete': 46, 'end': 35, 'pageup': 33, 'page_up': 33, 'pu': 33, 'pagedown': 34, 'page_down': 34, 'pd': 34, 'left': 37, 'up': 38, 'right': 39, 'down': 40, 'f1': 112, 'f2': 113, 'f3': 114, 'f4': 115, 'f5': 116, 'f6': 117, 'f7': 118, 'f8': 119, 'f9': 120, 'f10': 121, 'f11': 122, 'f12': 123 }
        var modifiers = { shift: { wanted: false, pressed: false }, ctrl: { wanted: false, pressed: false }, alt: { wanted: false, pressed: false }, meta: { wanted: false, pressed: false} }; if (e.ctrlKey) modifiers.ctrl.pressed = true; if (e.shiftKey) modifiers.shift.pressed = true; if (e.altKey) modifiers.alt.pressed = true; if (e.metaKey) modifiers.meta.pressed = true; for (var i = 0; k = keys[i], i < keys.length; i++) { if (k == 'ctrl' || k == 'control') { kp++; modifiers.ctrl.wanted = true; } else if (k == 'shift') { kp++; modifiers.shift.wanted = true; } else if (k == 'alt') { kp++; modifiers.alt.wanted = true; } else if (k == 'meta') { kp++; modifiers.meta.wanted = true; } else if (k.length > 1) { if (special_keys[k] == code) kp++; } else if (opt['keycode']) { if (opt['keycode'] == code) kp++; } else { if (character == k) kp++; else { if (shift_nums[character] && e.shiftKey) { character = shift_nums[character]; if (character == k) kp++; } } } }
        if (kp == keys.length && modifiers.ctrl.pressed == modifiers.ctrl.wanted && modifiers.shift.pressed == modifiers.shift.wanted && modifiers.alt.pressed == modifiers.alt.wanted && modifiers.meta.pressed == modifiers.meta.wanted) {
            callback(e); if (!opt['propagate']) {
                e.cancelBubble = true; e.returnValue = false; if (e.stopPropagation) { e.stopPropagation(); e.preventDefault(); }
                return false;
            } 
        } 
    }
    this.all_shortcuts[shortcut_combination] = { 'callback': func, 'target': ele, 'event': opt['type'] }; if (ele.addEventListener) ele.addEventListener(opt['type'], func, false); else if (ele.attachEvent) ele.attachEvent('on' + opt['type'], func); else ele['on' + opt['type']] = func;
}, 'remove': function(shortcut_combination) {
    shortcut_combination = shortcut_combination.toLowerCase(); var binding = this.all_shortcuts[shortcut_combination]; delete (this.all_shortcuts[shortcut_combination])
    if (!binding) return; var type = binding['event']; var ele = binding['target']; var callback = binding['callback']; if (ele.detachEvent) ele.detachEvent('on' + type, callback); else if (ele.removeEventListener) ele.removeEventListener(type, callback, false); else ele['on' + type] = false;
} 
}