How to show HTMl5 file upload progress with file size

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C#

HTML5

MVC3

In my application i am showing HTML file upload progress event with %(percentage)...
Now I want to show its like 20KB/100KB...(Uploading Size)/(Total Size)...
In progress event what should i have to do..This is my now code...what should i have to change which will show such format in span ..

  // Update progress bar
xhr.upload.addEventListener("progress", uploadProgress, false);

function uploadProgress(evt) {

   if (evt.lengthComputable) {
      var percentComplete = Math.round(evt.loaded * 100 / evt.total);
				                  
      //for my progrss bar

      $(fileParentDivobj).find("progress").attr('value',evt.loaded);
      $(fileParentDivobj).find("progress").attr('max',evt.total);
      $(fileParentDivobj).find(".ImgDiv").find("span").html(percentComplete + '%');
   }
}//upload progress