// JavaScript Document
function popupImage(event, img, box_id) {

  var x, y;
  var w;
  
  w = document.getElementById(box_id);
  
  if (window.event) {
    x = window.event.clientX + document.documentElement.scrollLeft
                             + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop +
                             + document.body.scrollTop;
  }
  else {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }
  x -= (2+170); 
  y -= (2+100);
  
  if (y > 500)
      y -= 400;
 // document.writeln (y);
  
  w.style.left = x;
  w.style.top = y;
  w.style.display = 'block'; 
  
  w.innerHTML="<img src='" + img + "' />";
}