document.writeln( "<div id=messlatte style='margin-left:-100em; width:100em; margin-top:-100em; height:100em'>x<\/div>" );
var breite_mess_px = document.getElementById('messlatte').offsetWidth;
var breite_display_px;
if ( window.innerWidth ) breite_display_px = window.innerWidth; else breite_display_px = document.body.clientWidth;
var breite_display_em = Math.round( breite_display_px *100 /breite_mess_px );
if ( typeof( breite_mind_em ) == 'undefined' )
{
  var breite_mind_em = 50; // mindestbreite kann im dokument vorgegeben sein - p593_deintern.htm
}

if ( breite_display_em < breite_mind_em )
{
  document.writeln( "<div style='width:" +breite_display_px +"px; height:5px; font-size:5px' title='" +breite_display_px +"px / " +breite_display_em +"em'>&nbsp;<\/div>" );
}
else
{
  if ( typeof css_50em == 'undefined' ) var css_50em = 'css/ueber_50em.css';
//var css_50em = 'css/ueber_50em.css';
  document.writeln( "<link rel='stylesheet' type='text/css' href='"+css_50em+"'>" );
  document.writeln( "<!--[if IE]><link rel='stylesheet' type='text/css' href='css/ie_ueber_50em.css'><![endif]-->" );
}