function atLeastV(version) { return(navigator.appVersion.charAt(0) >= version) }
function isMac() { return(navigator.appVersion.indexOf('Mac') != -1) }
function isWin() { return(navigator.appVersion.indexOf('Win') != -1) }
function isNav() { return(navigator.appName == 'Netscape') }
function isMSIE() { return(navigator.appName == 'Microsoft Internet Explorer') }