JQuery :: Menu Must Be Selected After Click On It?

i have created menu dropdown as css based but problem is that when i am going to click on any menue it will remain same after post back so now i want to select those menue link wether i have clicked.

i have follwing code here is 2 main menu links

1 Dashboard: it has no child links

2 Manage security: it has 2 child links

when i click any one of them links from Manage security menue, all retain same after specific page is redirected so how can i select such menue which page is redirected.......

Code is followed......

<div id="firstpane"> <!--Code for menu starts here-->
<p><a id="A2" href="~/Dashboard.aspx" runat="server"><span>Dashboard</span></a></p>
<p>Manage Security</p>
<div>
<a id="A3" href="~/Modules/AdminSecurity/ManageFeatures.aspx" runat="server">Manage Features</a>
<a id="A4" href="~/Modules/AdminSecurity/ManageRole.aspx" runat="server">Manage Roles</a>
</div>
</div>
</div> <!--Code for menu ends here-->