//first bit - can use for dhtml such as:     if (ns4) or if (ie4)
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false


//second bit - returns straight 1 figure browser version
var ver = parseInt(navigator.appVersion)


//fourth bit - use like: if (ns&&v4) or if (ie&&v4) etc...

var ns = navigator.appName.indexOf('Netscape')>=0? true:false
var ie = navigator.appName.indexOf('Microsoft')>=0? true:false
var v4 = parseInt(navigator.appVersion)>=4? true:false