Dropdown menu

Hvordan laver jeg en vertikal dropdown menu, men roll over grafik? det andet link i menuen skal have 4 undermenuer?
Jeg har dette stykke kode.

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            <p align="center"><font face="Arial" size="1"><a href="sider/forside.htm" target="indhold" title="Gå til forsiden." OnMouseOut="na_restore_img_src('knap1', 'document')" OnMouseOver="na_change_img_src('knap1', 'document', 'grafik/port2-knap1a.png', true);"><img src="grafik/port2-knap1.png" width="87" height="20" border="0" alt="port2-knap1.png" name="knap1"></a><a href="sider/produkter.htm" target="indhold" title="Se vores produkter." OnMouseOut="na_restore_img_src('knap2', 'document')" OnMouseOver="na_change_img_src('knap2', 'document', 'grafik/port2-knap2a.png', true);"><img src="grafik/port2-knap2.png" width="85" height="20" border="0" alt="port2-knap2.png" name="knap2"></a><a href="sider/storrelser.htm" target="indhold" title="Se størrelses tabel." OnMouseOut="na_restore_img_src('image1', 'document')" OnMouseOver="na_change_img_src('image1', 'document', 'grafik/port2-knap3a.png', true);"><img src="grafik/port2-knap3.png" width="85" height="20" border="0" alt="port2-knap3.png" name="image1"></a><a href="sider/bestilling.htm" target="indhold" title="Bestillings seddel." OnMouseOut="na_restore_img_src('knap4', 'document')" OnMouseOver="na_change_img_src('knap4', 'document', 'grafik/port2-knap4a.png', true);"><img src="grafik/port2-knap4.png" width="85" height="20" border="0" alt="port2-knap4.png" name="knap4"></a><a href="sider/kontakt.htm" target="indhold" title="Kontakt Vilmanns." OnMouseOut="na_restore_img_src('knap5', 'document')" OnMouseOver="na_change_img_src('knap5', 'document', 'grafik/port2-knap5a.png', true);"><img src="grafik/port2-knap5.png" width="85" height="20" border="0" alt="port2-knap5.png" name="knap5"></a></font></p>
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