To see it in action, select all of the code, cut and paste it into notepad. Save it as "vertmenu.html" then find the file that you just saved and double click on it.
Here is a picture of it in action:
<style type="text/css"> #navigation {width: 180px; font-size: 1em; Font-family: arial;} #navigation ul { margin: 0px; padding: 0px; } ul.top-level { background: #CCf; } #navigation li { list-style: none; } ul.top-level li { border-bottom: #fff solid; border-top: #fff solid; border-width: 1px; } #navigation a { color: #000; cursor: pointer; display:block; height:25px; line-height: 25px; text-indent: 10px; text-decoration:none; width:100%; } #navigation a:hover{ text-decoration:underline; } #navigation li:hover {background: #DDF; position:top; } ul.sub-level { display:none; width:600px; height:220px; } li:hover .sub-level { background: #EEF; border: #fff solid; border-width: 1px; display: block; position: absolute; left: 180px; top: 5px; } ul.sub-level li { border: none; float:left; width:180px; } #navigation .sub-level { background: #EEF; } /*IE RESET HELPER*/ li:hover .sub-level .sub-level { display:none; } .sub-level li:hover .sub-level { display:block; } </style> <div id="navigation"> <ul class="top-level"> <li> <a href="http://www.gentech.com/about-gentech/" title="About us">About us</a> <ul class="sub-level"> <li> <a href="http://www.gentech.com/gentech-contact-information/" title="How to Contact GenTech ">Contact us</a> </li> <li> <a href="http://www.gentech.com/gentech-catalog/" title="GenTech Catalog">Our Catalog</a> </li> <li> <a href="http://www.gentech.com/gentech-employment/" title="GenTech Employment"> Employment Openings</a> </li> <li> <a href="http://www.gentech.com/gentech-financing/" title="GenTech Financing">Our Financing</a> </li> <li> <a href="http://www.gentech.com/guide-to-mass-specs/" title="Compare Mass Spectrometer Features">Guide to MS</a> </li> <li> <a href="http://www.gentech.com/gentech-history/" title="GenTech History">Our History</a> </li> <li class="cat-item cat-item-14"> <a href="http://www.gentech.com/gentech-terms/" title="GenTech Term and Conditions">Our Terms</a> </li> <li> <a href="http://www.gentech.com/gentech-testimonials/" title="GenTech Testimonials">Customer Testimonials</a> </li> <li> <a href="http://www.gentech.com/gentech-warranty/" title="GenTech Warranty">Our Warranty</a> </li> <li> <a href="http://www.gentech.com/10-reasons-to-choose-gentech/" title="10 Reasons to Choose GenTech">Why Choose GenTech</a> </li> <li> <a href="http://www.gentech.com/useful-links/" title="Useful Analytical Equipment Links">Useful Links</a> </li> </ul> </li> <li> <a href="http://www.gentech.com/gc/" title="Used Gas Chromatography Equipment"> GC </a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/gc/agilenthp-gc/" title="Used Agilent/HP Gas Chromatography">Agilent/HP GC</a> </li> <li> <a href="http://www.gentech.com/category/gc/perkin-elmer-gc/" title="Used Perkin Elmer Gas Chromatography">Perkin Elmer GC</a> </li> <li><a href="http://www.gentech.com/category/gc/shimadzu-gc/" title="Used Shimadzu Gas Chromatography">Shimadzu GC</a> </li> <li><a href="http://www.gentech.com/category/gc/other-gc/" title="Other Gas Chromatography Instruments">Other GC</a> </li> <li><a href="http://www.gentech.com/category/gc/gc-accessories/" title="Gas Chromatography Instrument Accessories">GC Accessories</a> </li> <li><a href="http://www.gentech.com/category/gc/gc-kits/" title="Gas Chromatography Installation Kits">GC Kits</a> </li> <li><a href="http://www.gentech.com/category/gc/gc-software/" title="Gas Chromatography Software">GC Software</a> </li> </ul> </li> <li><a href="http://www.gentech.com/hplc/" title="Used HPLC Equipment">HPLC</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/hplc/new-hplc-systems/" title="New HPLC Systems">New HPLC Systems</a> </li> <li><a href="http://www.gentech.com/category/hplc/agilenthp-hplc/" title="Used Agilent/HP HPLC Instruments">Agilent/HP HPLC</a> </li> <li><a href="http://www.gentech.com/category/hplc/perkin-elmer-hplc/" title="Used Perkin Elmer HPLC Instruments">Perkin Elmer HPLC</a> </li> <li><a href="http://www.gentech.com/category/hplc/shimadzu-hplc/" title="Used Shimadzu HPLC Instruments">Shimadzu HPLC</a> </li> <li><a href="http://www.gentech.com/category/hplc/waters-hplc/" title="Used Waters HPLC Instruments">Waters HPLC</a> </li> <li><a href="http://www.gentech.com/category/hplc/other-hplc/" title="Other HPLC Instruments">Other HPLC </a> </li> <li><a href="http://www.gentech.com/category/hplc/hplc-kits/" title="HPLC Instruments Installation Kits">HPLC Kits</a> </li> <li><a href="http://www.gentech.com/category/hplc/hplc-software/" title="HPLC Instrument Software">HPLC Software</a> </li> </ul> </li> <li><a href="http://www.gentech.com/mass-spec/" title="Used Mass Spectrometer Equipment">Mass Spectrometer</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/mass-spec/gcms-systems/" title="Used GC/MS Instruments">GC/MS Systems</a> </li> <li><a href="http://www.gentech.com/category/mass-spec/lcms-systems/" title="Used LC/MS Instruments">LC/MS Systems</a> </li> <li><a href="http://www.gentech.com/category/mass-spec/mass-spec-kits/" title="Mass Spec Instruments Installation Kits">Mass Spec Kits</a> </li> <li><a href="http://www.gentech.com/category/mass-spec/ms-accessories/" title="Mass Spec Instruments Accessories">MS Accessories</a> </li> </ul> </li> <li><a href="http://www.gentech.com/aaicp/" title="Used AA/ICP Equipment">AA/ICP</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/aa-icp/atomic-absorption/" title="Used AA Instruments">Atomic Absorption</a> </li> <li><a href="http://www.gentech.com/category/aa-icp/icp/" title="Used ICP Instruments">ICP Instruments</a> </li> </ul> </li> <li><a href="http://www.gentech.com/miscellaneous/" title="Misc Analytical Instruments">Misc.</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/misc/edwards-pumps/" title="New and Used Edwards Pumps">Edwards Pumps</a> </li> <li><a href="http://www.gentech.com/category/misc/other-instruments/" title="Other Used Instruments">Other Instruments</a> </li> <li><a href="http://www.gentech.com/category/misc/pfeiffer-pumps/" title="Used Pfeiffer Pumps">Pfeiffer Pumps</a> </li> <li><a href="http://www.gentech.com/category/misc/varian-pumps/" title="New Varian Pumps">Varian Pumps</a> </li> </ul> </li> <li><a href="http://www.gentech.com/parts-department/" title="Analytical Instrument Parts">Parts Department</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/category/parts-dept/finnigan-parts/" title="Thermo Finnigan Instrument Parts">Thermo Finnigan Parts</a> </li> <li><a href="http://www.gentech.com/category/parts-dept/hp-parts/" title="HP Instrument Parts">HP Instrument Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/1100/" title="HP 1100 HPLC Instrument Parts">
&
HP 1100 HPLC Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/5890/" title="HP 5890 GC Instrument Parts">
&
HP 5890 GC Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/59715972/" title="HP 5972 MS Instrument Parts">
&
HP 5970-72 MS Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/5973/" title="HP 5973 MS Instrument Parts">&HP 5973 MS Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/6890/" title="HP 6890 GC Instrument Parts">&HP 6890 GC Parts</a> </li> <li> <a href="http://www.gentech.com/category/parts-dept/hp-parts/7673/" title="HP 7673 Autosampler Parts">&HP 7673 AS Parts</a> </li> <li><a href="http://www.gentech.com/category/parts-dept/other-parts/" title="Other Scientific Instrument Parts">Other Instrument </a> </li> <li><a href="http://www.gentech.com/category/parts-dept/perkin-elmer-parts/" title="Perkin Elmer Instrument Parts">Perkin Elmer </a> </li> <li><a href="http://www.gentech.com/category/parts-dept/pfeiffer-parts/" title="Pfeiffer Instrument Parts">Pfeiffer Parts</a> </li> <li><a href="http://www.gentech.com/category/parts-dept/tekmar-parts/" title="Tekmar Instrument Parts">Tekmar Instrument Parts</a> </li> <li><a href="http://www.gentech.com/category/parts-dept/varian-parts/" title="Varian Instrument Parts">Varian Instrument Parts</a> </li> </ul> </li> <li><a href="http://www.gentech.com/services-overview/" title="Analytical Instrument Services">Services</a> <ul class="sub-level"> <li><a href="http://www.gentech.com/bench-repair/" title="Analytical Instrument Repair">Bench Repair</a> </li> <li><a href="http://www.gentech.com/installation/" title="Analytical Instrument Installation">Instrument Installation</a> </li> <li><a href="http://www.gentech.com/packing-instructions/" title="Instrument Packing Instructions">Packing Instructions</a> </li> <li><a href="http://www.gentech.com/request-service-form/" title="Request Instrument Service Form">Request Service Form</a> </li> <li><a href="http://www.gentech.com/service/" title="Instrument Service Information">Service Information</a> </li> <li><a href="http://www.gentech.com/shipping/" title="Analytical Instrument Shipping">Instrument Shipping</a> </li> <li><a href="http://www.gentech.com/circuit-board-repair" title="Analytical Circuit Board Repair">Circuit Board Repair</a> </li> </ul> </li> </ul> </div>