my tab menu does not change color when clicked!!!

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CSS

Hi,
Can anybody tell me why my css doesnot work? my tab does not change color when i click it even though i have given a different in acive and visited in css. I do not know much CSS so can some body help me n tell me where i am going wrong? pasting my css here.....the css for tabs is after primary layout....

/* DEFAULTS
----------------------------------------------------------*/
body
{
    background: #b6b7bc;
    font-size: .80em;
    font-family: "Helvetica Neue", "Lucida Grande", "Segoe UI", Arial, Helvetica, Verdana, sans-serif;
    margin: 0px 0px 0px 1px;
    padding: 0px;
    color: #696969;
    height: 55px;
}
a:link, a:visited
{
    color: #034af3;
}
a:hover
{
    color: #1d60ff;
    text-decoration: none;
}
a:active
{
    color: #034af3;
}
p
{
    margin-bottom: 10px;
    line-height: 1.6em;
}

/* PRIMARY LAYOUT ELEMENTS
----------------------------------------------------------*/
.page
{
    width: 960px;
    background-color: #fff;
    margin: 20px auto 0px auto;
    border: 1px solid #496077;
}
.header
{
    position: relative;
    margin: 0px;
    padding: 0px;
    background: #4b6c9e;
    width: 100%;
    top: 2px;
    left: 0px;
    height: 120px;
}
.header h1
{
    font-weight: 700;
    margin: 0px;
    padding: 0px 0px 0px 20px;
    color: #f9f9f9;
    border: none;
    line-height: 2em;
    font-size: 2em;
}
.main
{
    padding: 0px 12px;
    margin: 12px 8px 8px 8px;
    min-height: 420px;
}
.leftCol
{
    padding: 6px 0px;
    margin: 12px 8px 8px 8px;
    width: 200px;
    min-height: 200px;
}
.footer
{
    color: #4e5766;
    padding: 8px 0px 0px 0px;
    margin: 0px auto;
    text-align: center;
    line-height: normal;
}

/* TAB MENU
----------------------------------------------------------*/
div.hideSkiplink
{
    background-color:#3a4f63;
    width:100%;
    height: 36px;
}
div.menu
{
    padding: 4px 0px 4px 8px;
}
div.menu ul
{
    list-style: none;
    margin: 0px;
    padding: 0px;
    width: auto;
}
div.menu ul li a, div.menu ul li a:visited
{
    background-color: #465c71;
    border: 1px #4e667d solid;
    color: #dde4ec;
    display: block;
    line-height: 1.35em;
    padding: 4px 20px;
    text-decoration: none;
    white-space: nowrap;
}
div.menu ul li a:hover
{
    background-color: #bfcbd6;
    color: #465c71;
    text-decoration: none;
}
div.menu ul li a:active
{
    background-color: #465c71;
    color:#cfdbe6;
    text-decoration: none;
}

Thank you.