var done=false;
function launchViewer(filename,x,y)
 {
 if (!done)
 {
  window.imagex=x;
  window.imagey=y;
  window.imagename=filename;
  w = x + 10; h = y + 20;
  viewer=window.open('/viewer/z.html','VIEWER','width='+w+',height='+h+',scrollbars,status,resizable');
  viewer.opener=window;
  viewer.focus();
 }
 return done;
 }