function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}
function changeImage(imgName,imgObj) {
	document.images[imgName].src = eval(imgObj+".src")
}
preload('imageHomeOver','/images/nav_home_over.gif');
preload('imageHomeOff','/images/nav_home_off.gif');
preload('imageWhoOver','/images/nav_who_over.gif');
preload('imageWhoOff','/images/nav_who_off.gif');
preload('imageScopeOver','/images/nav_scope_over.gif');
preload('imageScopeOff','/images/nav_scope_off.gif');
preload('imageConsultingOver','/images/nav_consulting_over.gif');
preload('imageConsultingOff','/images/nav_consulting_off.gif');
preload('imageServicesOver','/images/nav_services_over.gif');
preload('imageServicesOff','/images/nav_services_off.gif');
preload('imageWantOver','/images/nav_want_over.gif');
preload('imageWantOff','/images/nav_want_off.gif');
preload('imageClientsOver','/images/nav_clients_over.gif');
preload('imageClientsOff','/images/nav_clients_off.gif');
preload('imageRecruitOver','/images/nav_recruit_over.gif');
preload('imageRecruitOff','/images/nav_recruit_off.gif');
preload('imageCareerOver','/images/nav_career_over.gif');
preload('imageCareerOff','/images/nav_career_off.gif');
preload('imageContactOver','/images/nav_contact_over.gif');
preload('imageContactOff','/images/nav_contact_off.gif');
preload('imageIndustryOver','/images/nav_industry_over.gif');
preload('imageIndustryOff','/images/nav_industry_off.gif');