The dropdown CSS menu appears to be malfunctioning

I've been struggling with creating a dropdown menu for some time now and I've reached a point where I need assistance. I've tried various solutions I found online, including watching tutorials on YouTube, but I can't seem to make it work correctly. Every time I implement a solution, something goes wrong, like text getting pushed down or elements shifting out of place. The last tutorial I tried can be found here: http://www.youtube.com/watch?v=_mdjwPzzKT8. The issue I'm facing now is that my submenu is not displaying at all. This is where I decided to seek help.

I am hoping that someone can assist me in fixing my code. Below is the CSS code I am currently using:

#topnav         { z-index:3;
                    padding-top:76px; }

#topnav ul li       { list-style-type:none; 
                    display:inline;
                    float:right;
                    }


#topnav ul li a     { font-family:Arial, Helvetica, sans-serif;
                        font-size:13px;
                        font-weight:bold;
                        text-decoration:none;
                        padding-left:15px;
                        }

#topnav ul li a:link        { color:#00aeef; }
#topnav ul li a:visited     { color:#00aeef; }
#topnav ul li a:active      { color:#f26532; }
#topnav ul li a:hover       { color:#f26532; }
#topnav ul li a:focus       { color:#f26532; }

#topnav li ul           { position:absolute;
                                left:-999em;
                                list-style-type:none;
                                }

#topnav li ul li            { border-top:0px;
                                clear:both;}

#topnav li:hoover ul        { left:auto; }

And here is the HTML code I am currently using:

<div id="topnav">
                <ul>
                    <li><a href="contact.html">CONTACT</a></li>
                    <li><a href="blog.html">BLOG</a></li>
                    <li><a href="over ons.html">OVER ONS</a></li>
                    <li><a href="gedragsbeinvloeding.html">GEDRAGSBEINVLOEDING</a></li>
                    <li><a href="onze diensten.html">ONZE DIENSTEN</a>
                        <ul>
                            <li><a href="onderzoek.html">ONDERZOEK</a></li>
                            <li><a href="advies.html">ADVIES</a></li>
                            <li><a href="lezingen.html">LEZINGEN</a></li>
                        </ul>                       
                    </li>
                    <li><a href="index.html">HOME</a></li>
                </ul>
            </div>

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