// library functions

function getCookie(name) 
{
	var start = document.cookie.indexOf(name + "=");
	var len = start + name.length + 1;
	
	if((!start) && (name != document.cookie.substring(0, name.length)))
	{
		return null;
	}
	
	if(start == -1)
	{
		return null;
	}
	
	var end = document.cookie.indexOf(";", len);
	
	if(end == -1)
	{
		end = document.cookie.length;
	}
	
	return unescape(document.cookie.substring(len, end));
}

function setCookie(name, value, expires, path, domain, secure) 
{
	var myCookie = name + "=" + escape(value) 
		+ ((expires) ? ";expires=" + expires.toGMTString() : "")
		+ ((path) ? ";path=" + path : "") 
		+ ((domain) ? ";domain=" + domain : "") 
		+ ((secure) ? ";secure" : "");
	document.cookie = myCookie;
}

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";
	}
}