// HTML transparent overlaid message
OverlayMessage = function ( container )
    {

    // Get the parent.
    var parent = container.parentNode;
    // Make the wrapper div.
    var wrapper = document.createElement( 'div' );
    wrapper.style.cssText = container.style.cssText;
    parent.insertBefore( wrapper, container );
    // Move the container into the wrapper.
    parent.removeChild( container );
    wrapper.appendChild( container );
    container.style.cssText = 'position: relative; width: 100%; height: 100%;';
    // Add the overlay div.
    this.overlay = document.createElement( 'div' );
    wrapper.appendChild( this.overlay );
    this.visibleStyle = 'position: relative; top: -70%; background-color: ' + OverlayMessage.backgroundColor + '; width: 40%; text-align: center; margin-left: auto; margin-right: auto; padding: 2em; border: 1px solid ' + OverlayMessage.borderColor + '; z-index: 100; opacity: .75; filter: alpha(opacity=75); ';
    this.invisibleStyle = 'display: none;';
    this.overlay.style.cssText = this.invisibleStyle;
    };

OverlayMessage.backgroundColor = '#eaeff4';
OverlayMessage.borderColor = '#333333';

OverlayMessage.prototype.Set = function ( message )
    {
    this.overlay.innerHTML = message;
    this.overlay.style.cssText = this.visibleStyle;
    };

OverlayMessage.prototype.Clear = function ()
    {
    this.overlay.style.cssText = this.invisibleStyle;
    };

OverlayMessage.SetBackgroundColor = function ( color )
    {
    OverlayMessage.backgroundColor = color;
    };

OverlayMessage.SetBorderColor = function ( color )
    {
    OverlayMessage.borderColor = color;
    };