// JavaScript Document
// Cookie manager

function setCookie(c_name,value,expiredays)
{
	var exdate = new Date();
	exdate.setDate(exdate.getDate() + expiredays);
	document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}


function getCookie(c_name)
{
	if (document.cookie.length > 0)
	{
		c_start = document.cookie.indexOf(c_name + "=");
		if (c_start != -1)
		{ 
			c_start = c_start + c_name.length + 1;
			c_end = document.cookie.indexOf(";", c_start);
			if (c_end == -1)
			{
				c_end=document.cookie.length;
				return unescape(document.cookie.substring(c_start,c_end));
			}
		} 
	}
	return "";
}


function checkCookie()
{
	username = getCookie('username');
	if (username != null && username != "")
	{
		alert('Welcome again ' + username + '!');
	}else{
		username = prompt('Please enter your name:', "");
	}
	if (username != null && username != "")
	{
		setCookie('username',username,365);
	}
}