function saveCookie(arg1,arg2,arg3,arg4){ //arg1=dataname arg2=data arg3=expiration days
	if(arg1&&arg2){
		var _exp, _path;
		if(arg3){
			var xDay = new Date;
			xDay.setDate(xDay.getDate() + eval(arg3));
			xDay = xDay.toGMTString();
			_exp = ';expires=' + xDay;
		}
		else _exp = '';
		if(arg4){
			_path = ';path=' + arg4;
		}
		else _path = '';
		document.cookie = escape(arg1) + '=' + escape(arg2) + _exp + _path + ';';
	}
	
	return false;
}

function loadCookie(arg){ //arg=dataname
	if(arg){
		var cookieData = document.cookie + ';';
		arg = escape(arg);
		var startPoint1 = cookieData.indexOf(arg);
		var startPoint2 = cookieData.indexOf('=', startPoint1) + 1;
		var endPoint = cookieData.indexOf(';', startPoint1);
		if(startPoint2<endPoint && startPoint1>-1 && startPoint2-startPoint1==arg.length+1){
			cookieData = cookieData.substring(startPoint2, endPoint);
			cookieData = unescape(cookieData);
			return cookieData;
		}
	}
	
	return false;
}

function deleteCookie(arg){ //arg=dataname
	if(arg){
		arg = escape(arg);
		var yDay = new Date;
		yDay.setHours(yDay.getHours() - 1); 
		yDay = yDay.toGMTString(); 
		document.cookie = arg + '=xxx' + ';expires=' + yDay;
	}
	
	return false;
}

function chkCookie(arg){ //arg=(name or value)
	if(document.cookie!=''){
		var _cookie = ' ' + document.cookie;
		var cookieData = _cookie.split(';');
		var cookieDataName = new Array(cookieData.length);
		var cookieDataValue = new Array(cookieData.length);
		var imax = cookieData.length;
		for(var i=0; i<imax; i++){
			if(cookieData[i].indexOf('=')>-1){
				cookieDataName[i] = cookieData[i].substring(1, cookieData[i].indexOf('='));
				cookieDataValue[i] = cookieData[i].substring(cookieData[i].indexOf('=')+1, cookieData[i].length);
			}
		}
		if(arg=='name' || arg=='NAME' || arg=='Name') return cookieDataName;
		if(arg=='value' || arg=='VALUE' || arg=='Value') return cookieDataValue;
		else return cookieData.length;
	}
	else if(!arg) return 0;
	
	return false;
}