function readCookie(name)
{
    name = name + '=';
    var cookies = document.cookie.split(';');
  
    for(var i = 0; i < cookies.length; ++i)
    {
	var c = cookies[i];
		
	while(c.charAt(0) == ' ')
	    c = c.substring(1, c.length);
		
	if (c.indexOf(name) == 0)
	    return c.substring(name.length, c.length);

    }
	
    return null;
}

function createCookie(name, value, days)
{
    var expires = '';

    if(days)
    {
	var date = new Date();
	date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
		
	expires = '; expires=' + date.toGMTString();
    }

    document.cookie = name + '=' + value + expires + '; path=/';
}