function setNumOfDay(inDay){
		var now = new Date();
		// fix the bug in Navigator 2.0, Macintosh
		fixDate(now);
		now.setTime(now.getTime() + inDay * 24 * 60 * 60 * 1000);
		
		return now;
	}
	
	function setCookie(name, value, expires, path, domain, secure) {
	  	var curCookie = name + "=" + escape(value) +
      		((expires) ? "; expires=" + expires.toGMTString() : "") +
      		((path) ? "; path=" + path : "") +
      		((domain) ? "; domain=" + domain : "") +
      		((secure) ? "; secure" : "");
  		document.cookie = curCookie;	
	}
	
	function getCookie(name) {
		var dc = document.cookie;
		var prefix = name + "=";
		var begin = dc.indexOf("; " + prefix);
		if (begin == -1) {
			begin = dc.indexOf(prefix);
		  	if (begin != 0) return null;
		} else {
		  	begin += 2;
		}
		var end = document.cookie.indexOf(";", begin);
		if (end == -1) end = dc.length;
		return unescape(dc.substring(begin + prefix.length, end));
	}
	
	function deleteCookie(name, path, domain) {
		if (getCookie(name)) {
			document.cookie = name + "=" +
				((path) ? "; path=" + path : "") +
				((domain) ? "; domain=" + domain : "") +"; expires=Thu, 01-Jan-70 00:00:01 GMT";
		}
	}
	
	function fixDate(date) {
		var base = new Date(0);
		var skew = base.getTime();
		if (skew > 0)
		date.setTime(date.getTime() - skew);
	}
	
	function cookieHas(cookie, val){
		if(cookie.indexOf('['+ val + ']') > -1){
			return true;
		}else{
			return false;
		}
	}