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;
}


function getNetscape()
// 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 == 'Netscape')
  {
    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 checkVersion()
{
  var msg = "yes";
  var ver = getInternetExplorerVersion();
  var ver2 = navigator.appName();

  var browser;

  if ( ver > -1 )
  {
    if ( ver >= 7.0 ) 
      msg = "yes"
    else
      msg = "no";
  }
  alert( ver2 );
}


var ver = getInternetExplorerVersion();

browser = 1;


if ( ver > -1 )
  {
    if ( ver >= 7.0 ) 
      browser = 1
    else
      browser = 0;
  }
 

var ver2 = navigator.appName();
  alert( ver2 );