// Replaces all instances of the given substring.
String.prototype.replaceAll = function(strTarget, strSubString) {
    var strText = this;
    var intIndexOfMatch = strText.indexOf( strTarget );
 
    // Keep looping while an instance of the target string
    // still exists in the string.
    while (intIndexOfMatch != -1) {
        // Relace out the current instance.
        strText = strText.replace( strTarget, strSubString )

        // Get the index of any next matching substring.
        intIndexOfMatch = strText.indexOf( strTarget );
    }
 
    // Return the updated string with ALL the target strings
    // replaced out with the new substring.
    return( strText );
}

// WheelHelper class from http://adomas.org/javascript-mouse-wheel/
function WheelHelper() {
    this.delegate = Silverlight.createDelegate(this, this.handleMouseWheel);
    if (window.addEventListener) {
        // DOMMouseScroll is for mozilla.
        window.addEventListener('DOMMouseScroll', this.delegate, false);
    }
    // IE/Opera.
    window.onmousewheel = document.onmousewheel = this.delegate;
    
    // Don't handle if the mouse is in the textarea
    this.shouldScroll = false;
    var xamlTextArea = document.getElementById(xamlTextAreaClientID );
    xamlTextArea.onmouseover = Silverlight.createDelegate(this, this.handleMouseEnter);
    xamlTextArea.onmouseout = Silverlight.createDelegate(this, this.handleMouseLeave);
    
    var jsTextArea = document.getElementById(jsTextAreaClientID);
    jsTextArea.onmouseover = Silverlight.createDelegate(this, this.handleMouseEnter);
    jsTextArea.onmouseout = Silverlight.createDelegate(this, this.handleMouseLeave);
}

WheelHelper.prototype.handleMouseEnter = function(event) {
    this.shouldScroll = true;
}

WheelHelper.prototype.handleMouseLeave = function(event) {
    this.shouldScroll = false;
}

WheelHelper.prototype.wheelScrolled = null;
WheelHelper.prototype.delegate = null;

WheelHelper.prototype.handleMouseWheel = function(event) {
    var delta = 0;
    if (!event) // For IE.
        event = window.event;
        
    if (this.shouldScroll) {
        event.returnValue = true;
        return;
    }
        
    if (event.wheelDelta) { //IE/Opera.
        delta = event.wheelDelta/120;
        // In Opera 9, delta differs in sign as compared to IE.
        if (window.opera)
            delta = -delta;
    }
    else if (event.detail) { // Mozilla case.
        // In Mozilla, sign of delta is different than in IE.
        // Also, delta is multiple of 3.
        delta = -event.detail/3;
    }
    // If delta is nonzero, handle it.
    // Basically, delta is now positive if wheel was scrolled up,
    // and negative, if wheel was scrolled down.
    if (delta && this.wheelScrolled)
        this.wheelScrolled(delta);
        
    // Prevent default actions caused by mouse wheel.
    // That might be ugly, but we handle scrolls somehow
    // anyway, so don't bother here..
    if (event.preventDefault)
        event.preventDefault();
        
    event.returnValue = false;
}

WheelHelper.prototype.detach = function() {
    if (this.delegate != null) {
        if (window.removeEventListener) {
            window.removeEventListener('DOMMouseScroll', this.delegate, false);
        }
        
        // IE/Opera.
        window.onmousewheel = document.onmousewheel = null;
        this.delegate = null;
    }
}