Hide anchor tag from url

soft_developer

Possible Duplicate:
How to hide anchor tag from URL

I have a menu which contains submenus, I want that onclick if each submenu, that will redirect me on a div of the php page :

For example if I want to go from :

Menu Menu1 –> Submenu1 I want that onclick of my sbmenu1 it redirect my on a div on page1#div_name without dipslay on the URL : www.page1.php#div_name, I just want www.page1.php

    <ul>
        <li><a href="#">Menu1</a>
            <ul>
                <li><a href="page1.php#div_name">Submenu1</a></li>
                <li><a href="page2.php#div_name">Submenu2</a></li> 
            </ul>
        </li>
    </ul>

How can I fix this?