Problem Related to asp LinkButton Control's Visibility

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ASP.NET

There is a Linkbutton Control in navigation menu

<li class="current"><a href="Home.aspx">Home</a>
      <ul>
      <li>
          <asp: LinkButton ID=" LinkButton1" runat="server" PostbackUrl="userwelcome.aspx">My Page</asp: LinkButton></li>
      </ul></li>

and the LinkButton's Visibility is set to False when Session is Null but it shows Blank square Block Menu under Home menu but when session is not null it is showing "My page" text on this LinkButton text which is working perfectly as i want.

But i want to Remove this Blank Square Block when session is Null.