function detectBrowser()
{
var browser=navigator.appName
var b_version=navigator.appVersion
var version=parseFloat(b_version)
if (((browser=="Netscape"||browser=="Microsoft Internet Explorer") && (version>=4)) || ((browser=="Opera") && (version>=8))  )
{}
else
  {alert("The system has detected that you are using an old browser version. This site has been designed to work with the following CSS2 compatible browsers : MS Explorer v6 and above, Firefox/Mozilla v5, Opera v9 and above. Difficulties may be encountered if using older versions of browsers")}
}