var done=false;

function iView(filename,x,y)
 {
 if (!done)
 {
  window.imagex=x;
  window.imagey=y;
  window.imagename=filename;
  viewer=window.open('z.html','VIEWER','scrollbars,status,resizable');
  viewer.opener=window;
  viewer.focus();
 }
 return done;
 }