function changeImage() 
      {
          var oImage = document.getElementById("imgPath");
               
        
          if (screen.width < 1152) 
              {
               oImage.src = "upload/pictures/home%20page/heitec1024.jpg";
              }
               
        else if ( screen.width >= 1152 && screen.width < 1280 ) 
              {
               oImage.src = "upload/pictures/home%20page/heitec1152.jpg";
              }
        
        else if (screen.width >= 1280) 
              {
               oImage.src = "upload/pictures/home%20page/heitec1280.jpg";
              }
      }