Here are the functions Im using:

Set Cookie:

function set_cookie ( name, value, exp_y, exp_m, exp_d, path, domain, secure )
{
  var cookie_string = name + "=" + escape ( value );

  if ( exp_y )
  {
    var expires = new Date ( exp_y, exp_m, exp_d );
    cookie_string += "; expires=" + expires.toGMTString();
  }

  if ( path )
        cookie_string += "; path=" + escape ( path );

  if ( domain )
        cookie_string += "; domain=" + escape ( domain );

  if ( secure )
        cookie_string += "; secure";

  document.cookie = cookie_string;
}

Read Cookie:

function get_cookie ( cookie_name )
{
  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}

Delete Cookie:

function delete_cookie ( cookie_name )
{
  var cookie_date = new Date ( );  // current date & time
  cookie_date.setTime ( cookie_date.getTime() - 1 );
  document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

The Jquery I use to construct the cookie:

    if(get_cookie('visible')== 'no') {
        $("#wrapper").hide();
        $(".help").hide();
        $("#slid .show").show();
        $("#slid .hide").hide();
        } else {
            $("#slid .show").hide();
            $("#slid .hide").show();
        }
    $("#slider").click(function() {
        if(get_cookie('visible')== null) {
            set_cookie('visible','no', 2020, 01,01, '/', 'domain.com');
        } else {
            delete_cookie('visible');
        }
            $(".help").slideToggle();
                $("#wrapper").animate({ opacity: 1.0 },200).slideToggle(200, function() {
                    $("#slid img").toggle();
                });
    });

Im trying to set the cookie for all pages that exist under domain.com with the path '/'.

However using these functions and jQuery it doesn't appear to be working, any anyone give me an idea of where im going wrong?