<ul role="navigation">
<li>
<a href="../Default.aspx" ><span class="icon">S</span>Home
</a> ;</li>
<li>
<a href="../admin/AdminFunction.aspx"><span class="icon">E</span>Admin</a>
</li>
<li>
<a href="../ContactUs.aspx"><span class="icon">M</span>Contact us</a>
</li>
</ul>
you can use ../ or ~/ Before Assigning Link, That indicates current Files or Folder