child theme-unsuccesfull modifying

Hello,
I use twenty ten child theme. I fallowed the instructions from http://codex.wordpress.org/Child_Themes and I put this code in twenty ten child stylesheet:
/*
Theme Name: Twenty Ten Child
Description: Child theme for the Twenty Ten theme
Author: Your name here
Template: twentyten
*/

@import url(“../twentyten/style.css”);

#site-title a {
color: #009900;
}

The #site title a changed color from black(color in parent stylesheet) to green(#009900), but when i try to put some other color (for exemple #C64848) and then i click update, there is no change on the page. Why’s that and how to resolve it?

Thank you