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function _setCookie(sName, sValue, nDDay){
	var expire = new Date();
	expire.setDate(expire.getDate() + nDDay);
	var oCookie = sName + "=" + sValue + "; path=/ ";
	if(typeof nDDay != "undefined"){
		oCookie += ";expires=" + expire.toGMTString() + ";";
	}
	document.cookie = oCookie;
}

function _getCookie(sName){
	sName = sName + '=';
	var cookieData = document.cookie;
	var start = cookieData.indexOf(sName);
	var sValue = '';
	if(start != -1){
		start += sName.length;
		var end = cookieData.indexOf(';', start);
		if(end == -1)end = cookieData.length;
		sValue = cookieData.substring(start, end);
	}
	return sValue;
}