/* Find Netscape 4
use on the page like so:
window.is = new findNav4();
if (is.nav4)
	doThis;
else
	doThis;
*/
function findNav4 () {
this.ua = navigator.userAgent.toLowerCase();
this.major = parseInt(navigator.appVersion);

this.nav = (this.ua.indexOf('mozilla') != -1 && this.ua.indexOf('spoofer') == -1 && this.ua.indexOf('compatible') == -1);
if (this.nav) {
    this.nav4  = this.major == 4;
    this.nav4up= this.major >= 4;
    this.nav5up= this.major >= 5;
    this.nav6  = this.major == 5;
    this.nav6up = this.nav5up;
}
}