[RESOLVED] Change color of selected hyperlink in a masterpage

[sgrya1]

I have used the accordion menu in a masterpage.
The top level is something like this:

                <Header>
                    <a href="default.aspx" onclick="return false;" class="Link" >HOME </a>  
                </Header>

Is there a way to change the color of the text if the selected menu item is active?

.HEADER
A:Active{color:red;}
{
}

in the style sheet doesn't seem to do anything.