/* Event Functions */

// Add an event to the obj given
// event_name refers to the event trigger, without the "on", like click or mouseover
// func_name refers to the function callback when event is triggered
function addEvent(obj, event_name, func_name) {

    if (obj != null) {

        if (obj.attachEvent) {
            obj.attachEvent("on" + event_name, func_name);
        } else if (obj.addEventListener) {
            obj.addEventListener(event_name, func_name, true);
        } else {
            obj["on" + event_name] = func_name;
        }

    }
}

// Removes an event from the object
function removeEvent(obj, event_name, func_name) {
    if (obj.detachEvent) {
        obj.detachEvent("on" + event_name, func_name);
    } else if (obj.removeEventListener) {
        obj.removeEventListener(event_name, func_name, true);
    } else {
        obj["on" + event_name] = null;
    }
}

// Stop an event from bubbling up the event DOM
function stopEvent(evt) {
    evt || window.event;
    if (evt.stopPropagation) {
        evt.stopPropagation();
        evt.preventDefault();
    } else if (typeof evt.cancelBubble != "undefined") {
        evt.cancelBubble = true;
        evt.returnValue = false;
    }
    return false;
}

// Get the obj that starts the event
function getElement(evt) {
    if (window.event) {
        return window.event.srcElement;
    } else {
        return evt.currentTarget;
    }
}
// Get the obj that triggers off the event
function getTargetElement(evt) {
    if (window.event) {
        return window.event.srcElement;
    } else {
        return evt.target;
    }
}
// For IE only, stops the obj from being selected
//function stopSelect(obj) {
//    if (typeof obj.onselectstart != 'undefined') {
//        addEvent(obj, "selectstart", function() { return false; });
//    }
//}

/*    Caret Functions     */

// Get the end position of the caret in the object. Note that the obj needs to be in focus first
function getCaretEnd(obj) {
    if (typeof obj.selectionEnd != "undefined") {
        return obj.selectionEnd;
    } else if (document.selection && document.selection.createRange) {
        var M = document.selection.createRange();
        try {
            var Lp = M.duplicate();
            Lp.moveToElementText(obj);
        } catch (e) {
            var Lp = obj.createTextRange();
        }
        Lp.setEndPoint("EndToEnd", M);
        var rb = Lp.text.length;
        if (rb > obj.value.length) {
            return -1;
        }
        return rb;
    }
}
// Get the start position of the caret in the object
function getCaretStart(obj) {
    if (typeof obj.selectionStart != "undefined") {
        return obj.selectionStart;
    } else if (document.selection && document.selection.createRange) {
        var M = document.selection.createRange();
        try {
            var Lp = M.duplicate();
            Lp.moveToElementText(obj);
        } catch (e) {
            var Lp = obj.createTextRange();
        }
        Lp.setEndPoint("EndToStart", M);
        var rb = Lp.text.length;
        if (rb > obj.value.length) {
            return -1;
        }
        return rb;
    }
}
// sets the caret position to l in the object
function setCaret(obj, l) {
    obj.focus();
    if (obj.setSelectionRange) {
        obj.setSelectionRange(l, l);
    } else if (obj.createTextRange) {
        m = obj.createTextRange();
        m.moveStart('character', l);
        m.collapse();
        m.select();
    }
}
// sets the caret selection from s to e in the object
function setSelection(obj, s, e) {
    obj.focus();
    if (obj.setSelectionRange) {
        obj.setSelectionRange(s, e);
    } else if (obj.createTextRange) {
        m = obj.createTextRange();
        m.moveStart('character', s);
        m.moveEnd('character', e);
        m.select();
    }
}

/*    Escape function   */
String.prototype.addslashes = function() {
    return this.replace(/(["\\\.\|\[\]\^\*\+\?\$\(\)])/g, '\\$1');
}
String.prototype.trim = function() {
    return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/, "$1");
};
/* --- Escape --- */

/* Offset position from top of the screen */
function curTop(obj) {
    toreturn = 0;
    while (obj) {
        toreturn += obj.offsetTop;
        obj = obj.offsetParent;
    }
    return toreturn;
}
function curLeft(obj) {
    toreturn = 0;
    while (obj) {
        toreturn += obj.offsetLeft;
        obj = obj.offsetParent;
    }
    return toreturn;
}
/* ------ End of Offset function ------- */

/* Types Function */

// is a given input a number?
function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}

/* Object Functions */

function replaceHTML(obj, text) {
    while (el = obj.childNodes[0]) {
        obj.removeChild(el);
    };
    obj.appendChild(document.createTextNode(text));
}