function bw_check()
  {
  is_major      = parseInt(navigator.appVersion);
  this.nver     = is_major;
  this.ver      = navigator.appVersion;
  this.agent    = navigator.userAgent;
  this.dom      = document.getElementById ? 1 : 0;
  this.opera    = window.opera ? 1 : 0;

  this.ie5      = (this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera) ? 1 : 0;
  this.ie6      = (this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera) ? 1 : 0;
  this.ie7      = (this.ver.indexOf("MSIE 7")>-1 && this.dom && !this.opera) ? 1 : 0;

  this.ie9      = (this.ver.indexOf("MSIE 9")>-1 && this.dom && !this.opera) ? 1 : 0;

  }

function testit()
  {

  var bw = new bw_check();
  maC = (bw.mac) ? " der auf einem Mac-System l\xE4uft" : "";

  if (bw.ie5)
    {
    alert("Dies ist ein IE 5"+maC);
    }
    if (bw.ie5 || bw.ie6 || bw.ie7)
    {
                 //  document.getElementById('wrapper_content').style.display="none";
                     document.getElementById('header_back').style.display="none";
                   document.getElementById('menue_sub').style.display="none";
                   document.getElementById('menue').style.display="none";
                   document.getElementById('wrapper_content').innerHTML = '<div style="	width:900px; height:auto;margin:0px auto 0px auto;position:relative;background-color:#d9dee2;"><img src="backgrounds/maenchen/browsercheck.jpg" /></div>';

    }
  }