if (document.images) { 

nav_search_jobson = new Image();
nav_search_jobson.src = "images/nav_search_jobs_on.gif";

nav_search_jobsoff = new Image();
nav_search_jobsoff.src = "images/nav_search_jobs_off.gif";

nav_job_notificationon = new Image();
nav_job_notificationon.src = "images/nav_job_notification_on.gif";

nav_job_notificationoff = new Image();
nav_job_notificationoff.src = "images/nav_job_notification_off.gif";

nav_post_jobson = new Image();
nav_post_jobson.src = "images/nav_post_jobs_on.gif";

nav_post_jobsoff = new Image();
nav_post_jobsoff.src = "images/nav_post_jobs_off.gif";

nav_resourceson = new Image();
nav_resourceson.src = "images/nav_resources_on.gif";

nav_resourcesoff = new Image();
nav_resourcesoff.src = "images/nav_resources_off.gif";

nav_abouton = new Image();
nav_abouton.src = "images/nav_about_on.gif";

nav_aboutoff = new Image();
nav_aboutoff.src = "images/nav_about_off.gif";

nav_contact_uson = new Image();
nav_contact_uson.src = "images/nav_contact_us_on.gif";

nav_contact_usoff = new Image();
nav_contact_usoff.src = "images/nav_contact_us_off.gif";

subnav_at_a_glanceon = new Image();
subnav_at_a_glanceon.src = "images/subnav_at_a_glance_on.gif";

subnav_at_a_glanceoff = new Image();
subnav_at_a_glanceoff.src = "images/subnav_at_a_glance_off.gif";

subnav_exec_managementon = new Image();
subnav_exec_managementon.src = "images/subnav_exec_management_on.gif";

subnav_exec_managementoff = new Image();
subnav_exec_managementoff.src = "images/subnav_exec_management_off.gif";

subnav_stonevilleon = new Image();
subnav_stonevilleon.src = "images/subnav_stoneville_on.gif";

subnav_stonevilleoff = new Image();
subnav_stonevilleoff.src = "images/subnav_stoneville_off.gif";

subnav_mahendraon = new Image();
subnav_mahendraon.src = "images/subnav_mahendra_on.gif";

subnav_mahendraoff = new Image();
subnav_mahendraoff.src = "images/subnav_mahendra_off.gif";

subnav_parason = new Image();
subnav_parason.src = "images/subnav_paras_on.gif";

subnav_parasoff = new Image();
subnav_parasoff.src = "images/subnav_paras_off.gif";

subnav_ohlsensenkeon = new Image();
subnav_ohlsensenkeon.src = "images/subnav_ohlsensenke_on.gif";

subnav_ohlsensenkeoff = new Image();
subnav_ohlsensenkeoff.src = "images/subnav_ohlsensenke_off.gif";

subnav_produsemon = new Image();
subnav_produsemon.src = "images/subnav_produsem_on.gif";

subnav_produsemoff = new Image();
subnav_produsemoff.src = "images/subnav_produsem_off.gif";

subnav_hurston = new Image();
subnav_hurston.src = "images/subnav_hurst_on.gif";

subnav_hurstoff = new Image();
subnav_hurstoff.src = "images/subnav_hurst_off.gif";

subnav_daehnfeldton = new Image();
subnav_daehnfeldton.src = "images/subnav_daehnfeldt_on.gif";

subnav_daehnfeldtoff = new Image();
subnav_daehnfeldtoff.src = "images/subnav_daehnfeldt_off.gif";

subnav_archiveson = new Image();
subnav_archiveson.src = "images/subnav_archives_on.gif";

subnav_archivesoff = new Image();
subnav_archivesoff.src = "images/subnav_archives_off.gif";

subnav_resourceson = new Image();
subnav_resourceson.src = "images/subnav_resources_on.gif";

subnav_resourcesoff = new Image();
subnav_resourcesoff.src = "images/subnav_resources_off.gif";

subnav_global_calendaron = new Image();
subnav_global_calendaron.src = "images/subnav_global_calendar_on.gif";

subnav_global_calendaroff = new Image();
subnav_global_calendaroff.src = "images/subnav_global_calendar_off.gif";

}

function on(imagename) {
    if (document.images) {
		document[ imagename ].src = eval( imagename + "on.src" );
    }
  }
function off (imagename) {
	if (document.images) {
		document[ imagename ].src = eval( imagename + "off.src" );
	}
}