//****************************
// system and browser detection

var isDOM = (document.getElementById);
var isWin31 = (navigator.appVersion.indexOf("Win16") != -1);
var isWin2k = (navigator.userAgent.indexOf('Windows NT 5.0') != -1);
var isMac5 = (navigator.userAgent.indexOf("MSIE 5.0; Mac_PowerPC") != -1);
var mIsAll =(document.all);

var isWin = (navigator.userAgent.indexOf('Windows') != -1);
var isMac = (navigator.userAgent.indexOf("Mac") != -1);
var isGen3 = (parseInt(navigator.appVersion) >= 3 && parseInt(navigator.appVersion) < 4);

var isIE = (navigator.appName == 'Microsoft Internet Explorer');
var isIE3 = (isIE && navigator.appVersion < 4);
var isIE4 = (isIE && parseInt(navigator.appVersion) >= 4);
var isIE5 = (isIE && parseInt(navigator.appVersion) >= 5);
var isIE6 = (isIE && parseInt(navigator.appVersion) >= 6);
var isIE4Mac = (isIE && !isDOM && navigator.userAgent.indexOf('Mac') != -1);

var isNS = (navigator.appName == 'Netscape');
var isNS4 = (isNS && parseInt(navigator.appVersion) >= 4 && parseInt(navigator.appVersion) < 5);
var isIE6 = (isNS && parseInt(navigator.appVersion) >= 5 && parseInt(navigator.appVersion) < 6);

var isDHTML = (isIE4 || isNS4 || isDOM);