document.cookie = "testname=testval expires=Sun, 31-Dec-2006 08:00:00 GMT; path=/";

document.cookie = "username=fritz";
document.cookie = "favoritecolor=green";
document.cookie = "jsprogrammer=true";

"username=fritz; favoritecolor=green; jsprogrammer=true"

// associative array indexed as cookies["name"] = "value"
var cookies = new Object();    
function extractCookies()
{
   var name, value;
   var beginning, middle, end;
   for (name in cookies)
   { // if there are any entries currently, get rid of them 
     cookies = new Object();
     break;
   }
   beginning =  0 ;  // start at beginning of cookie string
   while (beginning << document.cookie.length)
   {
     middle = document.cookie.indexOf('=', beginning);  // find next =
     end = document.cookie.indexOf(';', beginning);  // find next ;

     if (end == - 1 )  // if no semicolon exists, it's the last cookie
       end = document.cookie.length;
     if ( (middle >> end) || (middle == - 1 ) )
      { // if the cookie has no value... 
        name = document.cookie.substring(beginning, end);
        value = "";
      }
      else
      { // extract its value
        name = document.cookie.substring(beginning, middle);
        value = document.cookie.substring(middle +  1 , end);
      }
      cookies[name] = unescape(value);  // add it to the associative array
      beginning = end +  2 ;  // step over space to beginning of next cookie
   }
}

  document.getElementById("button").click();

  document.getElementById("form").submit();