Hi Karen,
I had good success using the following code which works great in Firefox:
<script language="JavaScript">
<!--
function mmLoadMenus() {
if (window.mm_menu_0517074519_0) return;
window.mm_menu_0517074519_0 = new Menu("root",105,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0517074519_0.addMenuItem("Awards","locatio n='awards/awards.htm'");
mm_menu_0517074519_0.addMenuItem("Company His tory","location='companyHistory/companyHistory.htm'");
mm_menu_0517074519_0.addMenuItem("Expertise","loca tion='expertise/expertise.htm'");
mm_menu_0517074519_0.hideOnMouseOut=true;
mm_menu_0517074519_0.bgColor='#555555';
mm_menu_0517074519_0.menuBorder=1;
mm_menu_0517074519_0.menuLiteBgColor='#FFFFFF';
mm_menu_0517074519_0.menuBorderBgColor='#777777';
window.mm_menu_0616061600_0 = new Menu("root",92,15,"Verdana, Arial, Helvetica, sans-serif",9,"#000000","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0616061600_0.addMenuItem("Bidder's Li sts","location='biddersLists/biddersLists.htm'");
mm_menu_0616061600_0.addMenuItem("Bid Results ","location='biddersLists/bidResults.htm'");
mm_menu_0616061600_0.hideOnMouseOut=true;
mm_menu_0616061600_0.bgColor='#555555';
mm_menu_0616061600_0.menuBorder=1;
mm_menu_0616061600_0.menuLiteBgColor='#FFFFFF';
mm_menu_0616061600_0.menuBorderBgColor='#777777';
window.mm_menu_0518104947_0 = new Menu("root",190,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0518104947_0.addMenuItem("Construction","l ocation='services/construction.htm'");
mm_menu_0518104947_0.addMenuItem("Geographic Information Systems","location='services/gis.htm'");
mm_menu_0518104947_0.addMenuItem("Grant Admin istration","location='services/grantAdministration.htm'");
mm_menu_0518104947_0.addMenuItem("Landscape A rchitecture","location='services/landscapeArchitecture.htm'");
mm_menu_0518104947_0.addMenuItem("Land Survey ing","location='services/landSurveying.htm'");
mm_menu_0518104947_0.addMenuItem("Municipal E ngineering","location='services/municipalEngineering.htm'");
mm_menu_0518104947_0.addMenuItem("Community Planning","location='services/planning.htm'");
mm_menu_0518104947_0.addMenuItem("Private Dev elopment","location='services/privateDevelopment.htm'");
mm_menu_0518104947_0.addMenuItem("Sanitary Se wer Evaluation & Survey","location= 'services/sanitarySewer.htm'");
mm_menu_0518104947_0.addMenuItem("Stormwater Management","location='services/stormwaterManagement.htm'");
mm_menu_0518104947_0.addMenuItem("Transportation", "location='services/transportation.htm'");
mm_menu_0518104947_0.addMenuItem("Wastewater Treatment","location='services/wastewaterTreatment.htm'");
mm_menu_0518104947_0.addMenuItem("Water Suppl y & Distribution","location='services/waterSupply&Distribution.htm'");
mm_menu_0518104947_0.hideOnMouseOut=true;
mm_menu_0518104947_0.bgColor='#555555';
mm_menu_0518104947_0.menuBorder=1;
mm_menu_0518104947_0.menuLiteBgColor='#FFFFFF';
mm_menu_0518104947_0.menuBorderBgColor='#777777';
window.mm_menu_0518105735_0 = new Menu("root",195,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0518105735_0.addMenuItem("Booster Sta tion","location='projects/boosterStation.htm'");
mm_menu_0518105735_0.addMenuItem("Business Pa rk & Pedestrian Path","location='
pr ojects/businessPark&PedestrianPath.htm'");
mm_menu_0518105735_0.addMenuItem("Fire Hydran t Locations & Map Book","locat ion='projects/fireHydrantlocationsMapBook.htm'");
mm_menu_0518105735_0.addMenuItem("Highland Dr ive Reconstruction","location='projects/highlandDriveReconstuction.htm'");
mm_menu_0518105735_0.addMenuItem("Hilbert Wur thmann Roadway","location='projects/hilbertWurthmannRoadway.htm'");
mm_menu_0518105735_0.addMenuItem("Hunter's Cr ossing","location='projects/huntersCrossing.htm'");
mm_menu_0518105735_0.addMenuItem("I-I Mitigation","location='projects/i-iMitigation.htm'");
mm_menu_0518105735_0.addMenuItem("Industrial Park","location='projects/industrialPark.htm'");
mm_menu_0518105735_0.addMenuItem("Ladish Towe r Modifications","location='projects/ladishTowerModifications.htm'");
mm_menu_0518105735_0.addMenuItem("Land Use&nb sp;Master Plan","location='projects/landUseMasterPlan.htm'");
mm_menu_0518105735_0.addMenuItem("Parcel Data ","location='projects/parcelData.htm'");
mm_menu_0518105735_0.addMenuItem("Pike River& nbsp;Improvements","location='projects/pikeRiverImprovements.htm'");
mm_menu_0518105735_0.addMenuItem("Renaissance  ;Business Park","location='projects/renaissanceBusinessPark.htm'");
mm_menu_0518105735_0.addMenuItem("T.I.D. #2", "location='projects/tid2.htm'");
mm_menu_0518105735_0.addMenuItem("WisPark","locati on='projects/wisPark.htm'");
mm_menu_0518105735_0.hideOnMouseOut=true;
mm_menu_0518105735_0.bgColor='#555555';
mm_menu_0518105735_0.menuBorder=1;
mm_menu_0518105735_0.menuLiteBgColor='#FFFFFF';
mm_menu_0518105735_0.menuBorderBgColor='#777777';
window.mm_menu_0518111136_0 = new Menu("root",105,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0518111136_0.addMenuItem("Community L inks","location='communityLinks/communityLinks.htm'");
mm_menu_0518111136_0.addMenuItem("Industry Li nks","location='industryLinks/industryLinks.htm'");
mm_menu_0518111136_0.addMenuItem("Trade Shows ","location='tradeShows/tradeShows.htm'");
mm_menu_0518111136_0.addMenuItem("White Paper s","location='whitePapers/whitePapers.htm'");
mm_menu_0518111136_0.hideOnMouseOut=true;
mm_menu_0518111136_0.bgColor='#555555';
mm_menu_0518111136_0.menuBorder=1;
mm_menu_0518111136_0.menuLiteBgColor='#FFFFFF';
mm_menu_0518111136_0.menuBorderBgColor='#777777';
window.mm_menu_0518111324_0 = new Menu("root",110,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0518111324_0.addMenuItem("Benefits","locat ion='careers/benefits.htm'");
mm_menu_0518111324_0.addMenuItem("Current Pos itions","location='careers/currentPositions.htm'");
mm_menu_0518111324_0.addMenuItem("How to  ;Apply","location='careers/howtoApply.htm'");
mm_menu_0518111324_0.hideOnMouseOut=true;
mm_menu_0518111324_0.bgColor='#555555';
mm_menu_0518111324_0.menuBorder=1;
mm_menu_0518111324_0.menuLiteBgColor='#FFFFFF';
mm_menu_0518111324_0.menuBorderBgColor='#777777';
window.mm_menu_0518111435_0 = new Menu("root",155,15,"Verdana, Arial, Helvetica, sans-serif",9,"#333333","#FFFFFF","#CCCCCC","#000084"," left","middle",3,0,300,-5,7,true,false,true,0,true,true);
mm_menu_0518111435_0.addMenuItem("Lake Geneva Headquarters","location='contacts/lakegenevaHeadquarters.htm'");
mm_menu_0518111435_0.addMenuItem("Milwaukee R egional Office","location='contacts/milwaukeeRegionalOffice.htm'");
mm_menu_0518111435_0.addMenuItem("Madison Off ice","location='contacts/madisonOffice.htm'");
mm_menu_0518111435_0.addMenuItem("Racine Offi ce","location='contacts/racineOffice.htm'");
mm_menu_0518111435_0.hideOnMouseOut=true;
mm_menu_0518111435_0.bgColor='#555555';
mm_menu_0518111435_0.menuBorder=1;
mm_menu_0518111435_0.menuLiteBgColor='#FFFFFF';
mm_menu_0518111435_0.menuBorderBgColor='#777777';
mm_menu_0616061600_0.writeMenus();
} // mmLoadMenus()
//-->
</script>
Hope this helps a bit!
Gareth