Saludos, arme esto de algunos post del foro, espero te sea de ayuda.
<html>
<script>
function getCookie( name ) {
var start = document.cookie.indexOf( name + "=" );
var len = start + name.length + 1;
if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
return null;
}
if ( start == -1 ) return null;
var end = document.cookie.indexOf( ';', len );
if ( end == -1 ) end = document.cookie.length;
return unescape( document.cookie.substring( len, end ) );
}
function galleta(){
document.cookie = "name=oeschger";
}
function imprime(){
alert(getCookie('name'));
}
</script>
<body>
<a href="#" onclick="javascript
:galleta();">Set</a>
<a href="#" onclick="javascript
:imprime();">Lee</a>
</body>
</html>
Suerte.