function get_cookie(Name) { 
            var search = Name + "=" 
            var returnvalue = ""; 
            if (document.cookie.length > 0) { 
                offset = document.cookie.indexOf(search) 
            if (offset != -1) { 
                offset += search.length 
                end = document.cookie.indexOf(";", offset); 
            if (end == -1) 
                end = document.cookie.length; 
                returnvalue=unescape(document.cookie.substring(offset, end)) 
                } 
        } 
        return returnvalue; 
}