function checkImages()
{
 if(document.getElementById)
 {
  var imagesArr = new Array();
  var setDefaultErrImg="https://www.omnisource.ca/images/image_nf.gif"; // Default image to be displayed on error
  var setDefaultErrTxt="Image Not Found"; // Default text to be displayed on error 
  imagesArr = document.getElementsByTagName("img");
  for(var i=0; i<imagesArr.length; i++)
  {
   if(!imagesArr[0].getAttribute("nc")=="1")
   {
    var tempImgAttrib=imagesArr[i].getAttribute("alt");
    imagesArr[i].setAttribute("alt","");
    if(imagesArr[i].width=="28" && imagesArr[i].height=="30")
    {
     imagesArr[i].src=setDefaultErrImg;
     imagesArr[i].setAttribute("alt",setDefaultErrTxt);
    }
    else
    {
     imagesArr[i].setAttribute("alt",tempImgAttrib);
    }
   }
  }
 }
}

window.onload=checkImages;