var isMinNS4 = (navigator.appName.indexOf("Netscape")>=0 && parseFloat(navigator.appVersion) >= 4 && parseFloat(navigator.appVersion) < 5)? true : false;
var isMinIE4 = (document.all)? true : false;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0)? true : false;
var isMinNS6 = (parseFloat(navigator.appVersion) >= 5 && navigator.appName.indexOf("Netscape")>=0 )? true: false;
var isMinIE  = (isMinIE4 ||isMinIE5 )? true : false;
var isMinNS  = (isMinNS4 ||isMinNS6 )? true : false;
var IsMacOS  = (navigator.userAgent.indexOf('Mac') >= 0 )