/**
* Create and return a "version 4" RFC-4122 UUID string.
*/
function randomUUID() {
  var s = [], itoh = '0123456789ABCDEF';
 
  // Make array of random hex digits. The UUID only has 32 digits in it, but we
  // allocate an extra items to make room for the '-'s we'll be inserting.
  for (var i = 0; i <36; i++) s[i] = Math.floor(Math.random()*0x10);
 
  // Conform to RFC-4122, section 4.4
  s[14] = 4;  // Set 4 high bits of time_high field to version
  s[19] = (s[19] & 0x3) | 0x8;  // Specify 2 high bits of clock sequence
 
  // Convert to hex chars
  for (var i = 0; i <36; i++) s[i] = itoh[s[i]];
 
  // Insert '-'s
  s[8] = s[13] = s[18] = s[23] = '-';
 
  return s.join('');
}

function sck( cookie_name ) {
document.cookie=cookie_name+"="+randomUUID()+"; expires=Monday, 01-Apr-2015 05:00:00 GMT";
}

function gck( check_name ) {
    // first we'll split this cookie up into name/value pairs
    // note: document.cookie only returns name=value, not the other components
    var a_all_cookies = document.cookie.split( ';' );
    var a_temp_cookie = '';
    var cookie_name = '';
    var cookie_value = '';
    var b_cookie_found = false; // set boolean t/f default f

    for ( i = 0; i < a_all_cookies.length; i++ )
    {
        // now we'll split apart each name=value pair
        a_temp_cookie = a_all_cookies[i].split( '=' );


        // and trim left/right whitespace while we're at it
        cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');

        // if the extracted name matches passed check_name
        if ( cookie_name == check_name )
        {
            b_cookie_found = true;
            // we need to handle case where cookie has no value but exists (no = sign, that is):
            if ( a_temp_cookie.length > 1 )
            {
                cookie_value = unescape( a_temp_cookie[1].replace(/^\s+|\s+$/g, '') );
            }
            // note that in cases where cookie is initialized but no value, null is returned
            return cookie_value;
            break;
        }
        a_temp_cookie = null;
        cookie_name = '';
    }
    if ( !b_cookie_found )
    {
        return null;
    }
}