function getInternetExplorerVersion()
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
{
  var rv = -1; // Return value assumes failure.
  
  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;
}

if(getInternetExplorerVersion() < 7 && getInternetExplorerVersion() > 1){
        document.write('<link rel="stylesheet" href="stylesheets/ie6.css" type="text/css" />');
}else{
    document.write('<link rel="stylesheet" href="stylesheets/main.css" type="text/css" />');
}