function openWindow(url) {

// width & height & top
var w = 520;
var h= 520;
var top = 48

// new window position -- right, left, center
var position = "center"

var winX = 32;
var winY = top;

bVer = parseInt(navigator.appVersion); 
if(bVer >= 4) {
	if(position=="right"){
		winX = screen.width - w -32;
		}
	if(position=="center"){
		winX = (screen.width/2)-(w/2);
		winY = (screen.height/2)-(h/2);
		}
}

popupWin = window.open(url,'newwin','toolbar=no,width='+ w +',height= ' + h + ',directories=no,status=no,scrollbars=auto,resizable=yes,top=' + winY + ',left=' + winX +',menubar=no');
}

<!-- load MAIN NAV button images -->

RGmenu1_off = new Image();
RGmenu1_off.src = "images/RG-menu_serv.gif";
RGmenu1_on = new Image();
RGmenu1_on.src = "images/RG-menu_serv_on.gif";

RGmenu2_off = new Image();
RGmenu2_off.src = "images/RG-menu_prod.gif";
RGmenu2_on = new Image();
RGmenu2_on.src = "images/RG-menu_prod_on.gif";

RGmenu3_off = new Image();
RGmenu3_off.src = "images/RG-menu_port.gif";
RGmenu3_on = new Image();
RGmenu3_on.src = "images/RG-menu_port_on.gif";

RGmenu4_off = new Image();
RGmenu4_off.src = "images/RG-menu_comp.gif";
RGmenu4_on = new Image();
RGmenu4_on.src = "images/RG-menu_comp_on.gif";

RGmenu5_off = new Image();
RGmenu5_off.src = "images/RG-menu_peop.gif";
RGmenu5_on = new Image();
RGmenu5_on.src = "images/RG-menu_peop_on.gif"; 

RGmenu6_off = new Image();
RGmenu6_off.src = "images/RG-menu_faqs.gif";
RGmenu6_on = new Image();
RGmenu6_on.src = "images/RG-menu_faqs_on.gif";

RGmenu7_off = new Image();
RGmenu7_off.src = "images/RG-menu_cont.gif";
RGmenu7_on = new Image();
RGmenu7_on.src = "images/RG-menu_cont_on.gif";

<!-- load portfolio menu images -->
portmenu1_off = new Image();
portmenu1_off.src = "images/portfolio-menu_02.gif";
portmenu1_on = new Image();
portmenu1_on.src = "images/portfolio-menu_02_on.gif";

portmenu2_off = new Image();
portmenu2_off.src = "images/portfolio-menu_04.gif";
portmenu2_on = new Image();
portmenu2_on.src = "images/portfolio-menu_04_on.gif";

portmenu3_off = new Image();
portmenu3_off.src = "images/portfolio-menu_06.gif";
portmenu3_on = new Image();
portmenu3_on.src = "images/portfolio-menu_06_on.gif";

portmenu4_off = new Image();
portmenu4_off.src = "images/portfolio-menu_08.gif";
portmenu4_on = new Image();
portmenu4_on.src = "images/portfolio-menu_08_on.gif";


<!-- load services submenu images -->
s1_off = new Image();
s1_off.src = "images/services_01.gif";
s1_on = new Image();
s1_on.src = "images/services_01_on.gif";

s2_off = new Image();
s2_off.src = "images/services_02.gif";
s2_on = new Image();
s2_on.src = "images/services_02_on.gif";

s3_off = new Image();
s3_off.src = "images/services_03.gif";
s3_on = new Image();
s3_on.src = "images/services_03_on.gif";

s4_off = new Image();
s4_off.src = "images/services_04.gif";
s4_on = new Image();
s4_on.src = "images/services_04_on.gif";

s5_off = new Image();
s5_off.src = "images/services_05.gif";
s5_on = new Image();
s5_on.src = "images/services_05_on.gif";

s6_off = new Image();
s6_off.src = "images/services_06.gif";
s6_on = new Image();
s6_on.src = "images/services_06_on.gif";

s7_off = new Image();
s7_off.src = "images/services_07.gif";
s7_on = new Image();
s7_on.src = "images/services_07_on.gif";


<!-- load products submenu images -->
p1_off = new Image();
p1_off.src = "images/products_01.gif";
p1_on = new Image();
p1_on.src = "images/products_01_on.gif";

p2_off = new Image();
p2_off.src = "images/products_02.gif";
p2_on = new Image();
p2_on.src = "images/products_02_on.gif";

p3_off = new Image();
p3_off.src = "images/products_03.gif";
p3_on = new Image();
p3_on.src = "images/products_03_on.gif";

p4_off = new Image();
p4_off.src = "images/products_04.gif";
p4_on = new Image();
p4_on.src = "images/products_04_on.gif";

p5_off = new Image();
p5_off.src = "images/products_05.gif";
p5_on = new Image();
p5_on.src = "images/products_05_on.gif";

<!-- load company submenu images -->
c1_off = new Image();
c1_off.src = "images/company_01.gif";
c1_on = new Image();
c1_on.src = "images/company_01_on.gif";

c2_off = new Image();
c2_off.src = "images/company_02.gif";
c2_on = new Image();
c2_on.src = "images/company_02_on.gif";

<!-- load people submenu images -->
pp1_off = new Image();
pp1_off.src = "images/people_01.gif";
pp1_on = new Image();
pp1_on.src = "images/people_01_on.gif";

pp2_off = new Image();
pp2_off.src = "images/people_02.gif";
pp2_on = new Image();
pp2_on.src = "images/people_02_on.gif";

pp3_off = new Image();
pp3_off.src = "images/people_03.gif";
pp3_on = new Image();
pp3_on.src = "images/people_03_on.gif";

<!-- load graphics submenu images -->
g0_off = new Image();
g0_off.src = "images/spacer.gif";
g0_on = new Image();
g0_on.src = "images/spacer.gif";


g1_off = new Image();
g1_off.src = "images/graphics-submenu_01.gif";
g1_on = new Image();
g1_on.src = "images/graphics-submenu_01_on.gif";

g2_off = new Image();
g2_off.src = "images/graphics-submenu_02.gif";
g2_on = new Image();
g2_on.src = "images/graphics-submenu_02_on.gif";

g3_off = new Image();
g3_off.src = "images/graphics-submenu_03.gif";
g3_on = new Image();
g3_on.src = "images/graphics-submenu_03_on.gif";

g4_off = new Image();
g4_off.src = "images/graphics-submenu_04.gif";
g4_on = new Image();
g4_on.src = "images/graphics-submenu_04_on.gif";

g5_off = new Image();
g5_off.src = "images/graphics-submenu_05.gif";
g5_on = new Image();
g5_on.src = "images/graphics-submenu_05_on.gif";

g6_off = new Image();
g6_off.src = "images/graphics-submenu_06.gif";
g6_on = new Image();
g6_on.src = "images/graphics-submenu_06_on.gif";

g7_off = new Image();
g7_off.src = "images/graphics-submenu_07.gif";
g7_on = new Image();
g7_on.src = "images/graphics-submenu_07_on.gif";

g8_off = new Image();
g8_off.src = "images/graphics-submenu_08.gif";
g8_on = new Image();
g8_on.src = "images/graphics-submenu_08_on.gif";

<!-- Menu Javascript Functions -->
function rollOn(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "_on.src");
  }
}

function rollOff(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "_off.src");
  }
}

function itemOn(imgName,layer) {
	if (document.all) {
    document[imgName].src = eval(imgName + "_on.src");
  }
  	else {	
	document.layers[layer].document[imgName].src = eval(imgName + "_on.src");
}
}

function itemOff(imgName,layer) {
	if (document.all) {
    document[imgName].src = eval(imgName + "_off.src");
  }
  	else {	
	document.layers[layer].document[imgName].src = eval(imgName + "_off.src");
}
}