function popupWin(url) {
  window.open(url,'popWin','scrollbars=yes,status=yes,toolbar=no,resizable=yes,width=600,height=500');
}

function browserSniff(){
var ua=navigator.userAgent
if(ua.indexOf('Firefox/2')!=-1){
alert('Firefox 2 has been detected. Please use an alternative browser or upgrade to Firefox 3. You are able to browse this store using Firefox 2, but you will not be able view the Checkout. To place your order you may call us on 0870 6260219, we apologise for any inconvenience')
}
}

browserSniff()