function popup (link, window_name, width, height, scrolls, resize)
{
  //if (!window.focus) return true;
  var href;
  if (typeof(link) == 'string')
    href=link;
  else
    href=link.href;
    
  var page_width = screen.width ;
//  var width = page_width*0.75 ;
//  var height = width*0.75
  var screen_x = page_width*0.15 ;
  var screen_y = page_width*0.10 ;

  if (!width)
    width = page_width*0.75 ;

  if (!height)
    height = width*0.75

//  alert(scrolls+resize)

  if(scrolls==null)
	var scrolls=1;
  if(!resize==null)
	var resize=1;



  var new_window = window.open(href, window_name, 'width='+width
         +',height='+height+',screenX='+screen_x+',screenY='+screen_y+',scrollbars='+scrolls+',resizable='+resize);
  if (window.focus) new_window.focus() ;
  return false;
}