function display_new(url, new_width, new_height)
 {
   sw = screen.width;
   xpos =300;
   ypos = 150;
   code='';
   isNetscape=navigator.appName.indexOf('Netscape')>=0;
   isExplorer=navigator.appName.indexOf('Explorer')>=0;
   if (isNetscape) code='screenX='+xpos+',screenY='+ypos+',';
   if (isExplorer) code='left='+xpos+',top='+ypos+',';
   window.open (url,'NewImage','width='+new_width+',height='+new_height+','+code+',scrollbars=1,toolbar=0,status=0,resizable=0')
 }