var imagesLoaded = false;

var images = new Array(
'http://www.law.unlv.edu/include/leftNav/butt_academicInfo.gif',
'http://www.law.unlv.edu/include/leftNav/butt_academicInfo_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_accreditation.gif',
'http://www.law.unlv.edu/include/leftNav/butt_accreditation_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_admissions.gif',
'http://www.law.unlv.edu/include/leftNav/butt_admissions_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_careerServices.gif',
'http://www.law.unlv.edu/include/leftNav/butt_careerServices_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_contactUs.gif',
'http://www.law.unlv.edu/include/leftNav/butt_contactUs_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_clinic.gif',
'http://www.law.unlv.edu/include/leftNav/butt_clinic_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_communityService.gif',
'http://www.law.unlv.edu/include/leftNav/butt_communityService_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_facultyStaff.gif',
'http://www.law.unlv.edu/include/leftNav/butt_facultyStaff_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_home.gif',
'http://www.law.unlv.edu/include/leftNav/butt_home_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_library.gif',
'http://www.law.unlv.edu/include/leftNav/butt_library_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_newsEvents.gif',
'http://www.law.unlv.edu/include/leftNav/butt_newsEvents_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_studentInfo.gif',
'http://www.law.unlv.edu/include/leftNav/butt_studentInfo_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_studentLife.gif',
'http://www.law.unlv.edu/include/leftNav/butt_studentLife_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_unlv.gif',
'http://www.law.unlv.edu/include/leftNav/butt_unlv_over.gif',
'http://www.law.unlv.edu/include/leftNav/butt_welcome.gif',
'http://www.law.unlv.edu/include/leftNav/butt_welcome_over.gif'
);

for(loop = 0; loop<images.length; loop++){
  var image = new Image();
  image.src = images[loop];
}

imagesLoaded = true;

function swapImage(){
  if (imagesLoaded) {
    document[swapImage.arguments[0]].src = [swapImage.arguments[1]];
  }
}