function setCookie(cname, cvalue, expires, path, domain, secure) {
	document.cookie = cname + "=" + escape(cvalue) + 
	((expires) ? "; expires=" + expires.toGMTString() : "") +
	((path) ? "; path=" + path : "") +
	((domain) ? "; domain=" + domain : "") +
	((secure) ? "; secure" : "");
}
function getCookie(cname){
	var prefix=cname + "=";
	var begin=document.cookie.indexOf("; " + prefix);
	if(begin==-1){
		begin=document.cookie.indexOf(prefix);
		if(begin != 0) return null;
	}
	else begin+=2;
	var end=document.cookie.indexOf(";",begin);
	if(end==-1){
		end=document.cookie.length;
	}
	return unescape(document.cookie.substring(begin + prefix.length, end));
}
function delCookie(cname){
	var exp=new Date();
	exp.setTime(exp.getTime()-1);
	var cval=getCookie(cname);
	document.cookie=cname + "=" + cval + "; expires=" + exp.toGMTString();
}
function getFutureDate(days){
	futureday=new Date();
	futureday.setTime(futureday.getTime() + (1000*60*60*24*days));
	return futureday;
}