function jsNav() {
   return ( navigator.appName == "Netscape" && navigator.appVersion >= "3" ) ||
          ( navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion >= "4" ) ; }
if ( jsNav() ) {
   about_off = new Image(80,25); about_off.src="images/about_off.gif" ;
   about_on = new Image(80,25); about_on.src="images/about_on.gif" ;
   home_off = new Image(100,25); home_off.src="images/home_off.gif" ;
   home_on = new Image(100,25); home_on.src="images/home_on.gif" ;
   officecontact_off = new Image(165,25); officecontact_off.src="images/officecontact_off.gif" ;
   officecontact_on = new Image(165,25); officecontact_on.src="images/officecontact_on.gif" ;
   specialties_off = new Image(112,25); specialties_off.src="images/specialties_off.gif" ;
   specialties_on = new Image(112,25); specialties_on.src="images/specialties_on.gif" ;
   testimonials_off = new Image(125,25); testimonials_off.src="images/testimonials_off.gif" ;
   testimonials_on = new Image(125,25); testimonials_on.src="images/testimonials_on.gif" ; }
function imgOff(i) {
  if ( jsNav() )
    document.images[i].src = eval(i + "_off.src") ; }
function imgOn(i) {
  if ( jsNav() )
   document.images[i].src = eval(i + "_on.src") ; }