function gf_getInternetExplorerVersion() {
  var rv = -1;
  if (navigator.appName == 'Microsoft Internet Explorer') {
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null) {
      rv = parseFloat( RegExp.$1 );
    }
  }
  return rv;
}
function gf_addEvent(obj, event, func) {
   if (obj.attachEvent) {
     obj['e'+event+func] = func;
     obj[event+func] = function() {
            obj['e'+event+func](window.event);
        }
     obj.attachEvent( 'on'+event, obj[event+func] );
    } else {
     obj.addEventListener(event, func, false);
    }
}
function gf_addBanner() {
		var newdiv = document.createElement('div');
		newdiv.setAttribute('align', 'center');
		newdiv.style.border = 'none';
		newdiv.style.margin = '10px';
		newdiv.style.clear = 'both';
  	newdiv.innerHTML = '<a href="http://www.getfirefox.de/" target="_blank"><img src="http://www.getfirefox.de/getfirefox-aktion.gif" border="0" /></a>';
  	
  	if (document.body.firstChild) {
  		document.body.insertBefore(newdiv, document.body.firstChild);
  	} else {
  		document.body.appendChild(newdiv);
  	}
}
function gf_checkVersion() {
  var ver = gf_getInternetExplorerVersion();

  if ( ver > -1 && ver < 7 ) {
  	gf_addEvent(window, 'load', gf_addBanner);
  }
}
gf_checkVersion();