PopDown Menu Not Working In Firefox

[SandP41]

The "Services" button on this navigation menu has a dropdown menu for various services. The code works fine for IE, but not on Firefox. Firefox will change the images on the mouseover, but will not display the dropdown menu. The inc_menu.htm is the navigation menu and it calls inc_javascript.htm. The link that is failing is the call to popdown:

[CODE] <a href="#" onMouseOut="popDown('elMenu1'); MM_swapImgRestore()"; onMouseOver="popUp('elMenu1',event);

http://www.portfoliohairanddayspa.com/inc_menu.htm

Here is the javascript code being called:

[CODE]
<!-- hide
function MM_findObj(n, d) { //v3.0
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
// -->
<!-- hide
NS4 = (document.layers);
IE4 = (document.all);
ver4 = (NS4 || IE4);
IE5 = (IE4 && navigator.appVersion.indexOf("5.")!=-1);
isMac = (navigator.appVersion.indexOf("Mac") != -1);
isMenu = (NS4 || (IE4 && !isMac) || (IE5 && isMac));
function popUp(){return};
function popDown(){return};
if (!ver4) event=null;

if (isMenu) {
fntCol = "#ffffff";
fntBold = false;
fntItal = false;
backCol = "#666666";
overCol = "#f19b44";
overFnt = "#ffffff";
fntSiz = 7;
fntFam = "verdana";
menuWidth = 115;
borWid = 1;
borCol = "#ffffff";
borSty = "solid";
itemPad = 4;
separator = 1;
separatorCol = "#ffffff";
imgSrc = "dropmenu/arr_menu_rt.gif";
imgSiz = 13;
childOffset = 2;
childOverlap = 6;
perCentOver = null;
secondsVisible = .5;
isFrames = false;
}
// -->
<!--
arMenu1 = new Array("",116,115,"","","","", "", "",
"Hair Services","hair.htm",0,
"Waxing","waxing.htm",0,
"Nail Services","nail.htm",0,
"Make-up Services","makeup.htm",0,
"Body Treatments","body.htm",0,
"Facials","facials.htm",0,
"Massage Therapy","massage.htm",0,
"Day Spa Packages","packages.htm",0,
"Bridal Services","bridal.htm",0,
"Corporate Advantage","corporate.htm",0
)
if (isMenu) {
document.write("<SCR"+"IPT LANGUAGE='JavaScript1.2' SRC='dropmenu/Menus.js'><\/SCR"+"IPT>");
}
//-->