Detect is browser is IE and what version

by isogunro

JavaScript

function getInternetExplorerVersion() //from http://msdn.microsoft.com/en-us/library/ms537509(v=vs.85).aspx
// 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;
}

alert(getInternetExplorerVersion());