function insert_bg(x,y,p_url){

// screen.availWidth

// screen.availHeight

   if (is_ie){

      if (document.body){ document.body.background = "";}

      document.write('<IMG id="div_bg" " SRC="' + p_url + '" STYLE="container:positioned; position:absolute; left:' + x + '; top:' + (y-1) + '; z-index:-1; display:">');

   }

   else if (is_nav4){ 

      document.write('<div id="div_bg" style="position:absolute; left:' + x + 'px; top:' + y + 'px; clip:rect(0, 2500, 2500, 0); width:100%; height:100%;  z-index:-1; layer-background-image:URL(' + p_url + ');"></div>');

      // NB next line required to force redraw

      //window.resizeBy(-1, -1);

      // NB next line required to stop infinite reload loop

      //document(close);

   }

   else {

      document.write('<div id="div_bg" style="position:absolute; left:' + x + 'px; top:' + (y-4) + 'px; clip:rect(0, 2500, 2500, 0); width:100%; height:100%;  z-index:-1;"><IMG ID="move-bg" SRC="' + p_url + '"></div>');

      // NB next line required to force redraw

      window.resizeBy(-1, -1);

      // NB next line required to stop infinite reload loop

      //document(close);

   }

}