var TypeHelpers = new function(){

   // I use me instead of this.  For reasons why, please read:
   // http://w3future.com/html/stories/callbacks.xml
   var me = this;

   me.hasSmoothing = function(){

      // IE has screen.fontSmoothingEnabled - sweet!
      if (typeof(screen.fontSmoothingEnabled) != "undefined") {
         return screen.fontSmoothingEnabled;
      } else {

         try {

            // Create a 35x35 Canvas block.
            var canvasNode = document.createElement('canvas');
            canvasNode.width = "35";
            canvasNode.height = "35"

            // We must put this node into the body, otherwise
            // Safari Windows does not report correctly.
            canvasNode.style.display = 'none';
            document.body.appendChild(canvasNode);
            var ctx = canvasNode.getContext('2d');

            // draw a black letter 'O', 32px Arial.
            ctx.textBaseline = "top";
            ctx.font = "32px Arial";
            ctx.fillStyle = "black";
            ctx.strokeStyle = "black";

            ctx.fillText("O", 0, 0);

            // start at (8,1) and search the canvas from left to right,
            // top to bottom to see if we can find a non-black pixel.  If
            // so we return true.
            for (var j = 8; j <= 32; j++) {
               for (var i = 1; i <= 32; i++) {

                  var imageData = ctx.getImageData(i, j, 1, 1).data;
                  var alpha = imageData[3];

                  if (alpha != 255 && alpha != 0) {
                     return true; // font-smoothing must be on.
                  }
               }

            }

            // didn't find any non-black pixels - return false.
            return false;
         }
         catch (ex) {
            // Something went wrong (for example, Opera cannot use the
            // canvas fillText() method.  Return null (unknown).
            return null;
         }
      }
   }

   me.insertClasses = function(){
      var result = me.hasSmoothing();
      var htmlNode = document.getElementsByTagName('html')[0];
      if (result == true) {
         htmlNode.className += " hasFontSmoothing-true";
      } else if (result == false) {
            htmlNode.className += " hasFontSmoothing-false";
      } else { // result == null
            htmlNode.className += " hasFontSmoothing-unknown";
      }
   }

}