var r = '/chopperman/';
var c = r + 'common/';
var d = document;
var n = navigator;

isWin = !!(n.userAgent.toLowerCase().indexOf("windows") != -1);
isMac = !!(n.userAgent.toLowerCase().indexOf("macintosh") != -1);
isOSX = !!(n.userAgent.toLowerCase().indexOf("os x") != -1);
isDOM = !!(d.getElementById);
isIE  = !!(d.all);
isNN = !!(n.userAgent.toLowerCase().indexOf("netscape") != -1);
isNN4 = !!(d.layers && isNN);
isNN6 = !!(isDOM && isNN);
isSafari = !!(n.userAgent.toLowerCase().indexOf("safari") != -1);
isFF = !!(n.userAgent.toLowerCase().indexOf("firefox") != -1);
isOpera = !!(n.userAgent.toLowerCase().indexOf("opera") != -1);