eventUtil.js

var EventUtil = {

    addHandler: function(element, type, handler) {
        if (element.addEventListener) { //normal DOM compatible operation
            element.addEventListener(type, handler, false);
        } else if (element.attachEvent) { //IE compatability
            element.attachEvent("on" + type, handler);
        } else {
            element["on" + type] = handler;
        }
    },

    getEvent: function(event) {
        return (event) ? event : window.event;
    },

    getTarget: function(event) {
        return event.target || event.srcElement;
    },

    getRelatedTarget: function(event) {
        if (event.relatedTarget) {
            return event.relatedTarget;
        } else if (event.toElement) {
            return even.toElement;
        } else if (event.fromElement) {
            return event.fromElement;
        } else {
            return null;
        }
    },

    getButton: function(event) {
        if (document.implementation.hasFeature("MouseEvents", "2.0")) {
            return event.button;
        } else {
            switch (event.button) {
                case 0:
                case 1:
                case 3:
                case 5:
                case 7:
                    return 0;
                case 2:
                case 6:
                    return 2;
                case 4:
                    return 1;
            }
        }
    },

    getWheelDelta: function(event) {
        if (event.wheelDelta) {
            return (client.engine.opera && (client.engine.opera < 9.5) ?
                -event.wheelDelta : event.wheelDelta);
        } else {
            return -event.detail * 40;
        }
    },

    getCharCode: function(event) {
        if (typeof event.charCode == "number") {
            return event.charCode;
        } else {
            return event.keyCode;
        }
    },
    /**
     * Cross browser functionality for retrieving clipboard text/data
     */
    getClipboardText: function(event) {
        var clipboardData = (event.clipboardData || window.clipboardData);
        return clipboardData.getData("text");
    },

    preventDefault: function(event) {
        if (event.preventDefault) {
            event.preventDefault();
        } else {
            event.returnValue = false;
        }
    },

    removeHandler: function(element, type, handler) {
        if (element.removeEventListener) { //normal DOM compatible operation
            element.removeEventListener(type, handler, false);
        } else if (element.detachEvent) { //IE compatability
            element.detachEvent("on" + type, handler);
        } else {
            element["on" + type] = null;
        }
    },

    stopPropagation: function(event) {
        if (event.stopPropagation) {
            event.stopPropagation();
        } else {
            event.cancelBubble = true;
        }
    },
    /**
     * Cross browser funcitonality for changing clipboard data
     */
    setClipboardData: function(event, value) {
        if (event.clipboardData) {
            return event.clipboardData.setData("text/plain", value);
        } else if (window.clipboardData) {
            return window.clipboardData.setData("text", value);
        }
    }

};