var loaded = 0;
function PreLoadImages() {
	if (document.images) {			
		//preload text top menu button images
		homeOut = new Image();
		homeOut.src= "images_menu/home_out.gif";
		homeOver = new Image();
		homeOver.src = "images_menu/home_over.gif";
		homeSel = new Image();
		homeSel.src = "images_menu/home_sel.gif";
		
		checklistOut = new Image();
		checklistOut.src= "images_menu/checklist_out.gif";
		checklistOver = new Image();
		checklistOver.src= "images_menu/checklist_over.gif";
		checklistSel = new Image();
		checklistSel.src = "images_menu/checklist_sel.gif";
		
		photosOut = new Image();
		photosOut.src = "images_menu/photos_out.gif";
		photosOver = new Image();
		photosOver.src = "images_menu/photos_over.gif";
		photosSel = new Image();
		photosSel.src = "images_menu/photos_sel.gif";
		
		linksOut = new Image();
		linksOut.src = "images_menu/links_out.gif";
		linksOver = new Image();
		linksOver.src = "images_menu/links_over.gif";
		linksSel = new Image();
		linksSel.src = "images_menu/links_sel.gif";
		
		contactOut = new Image();
		contactOut.src = "images_menu/contact_out.gif";
		contactOver = new Image();
		contactOver.src = "images_menu/contact_over.gif";
		contactSel = new Image();
		contactSel.src = "images_menu/contact_sel.gif";
		
		mapsOut = new Image();
		mapsOut.src = "images_menu/maps_out.gif";
		mapsOver = new Image();
		mapsOver.src = "images_menu/maps_over.gif";
		mapsSel = new Image();
		mapsSel.src = "images_menu/maps_sel.gif";
		
		searchOut = new Image();
		searchOut.src = "images_menu/search_out.gif";
		searchOver = new Image();
		searchOver.src = "images_menu/search_over.gif";
		searchSel = new Image();
		searchSel.src = "images_menu/search_sel.gif";
		
		helpOut = new Image();
		helpOut.src = "images_menu/help_out.gif";
		helpOver = new Image();
		helpOver.src = "images_menu/help_over.gif";
		helpSel = new Image();
		helpSel.src = "images_menu/help_sel.gif";
		
		//preload text tab button images
		
		tab_spchk_out = new Image();
		tab_spchk_out.src = "images_tabs/tab_spchk_out.gif";
		tab_spchk_over = new Image();
		tab_spchk_over.src = "images_tabs/tab_spchk_over.gif";
		tab_spchk_sel = new Image();
		tab_spchk_sel.src = "images_tabs/tab_spchk_sel.gif";
		
		tab_thumb_out = new Image();
		tab_thumb_out.src = "images_tabs/tab_thumb_out.gif";
		tab_thumb_over = new Image();
		tab_thumb_over.src = "images_tabs/tab_thumb_over.gif";
		tab_thumb_sel = new Image();
		tab_thumb_sel.src = "images_tabs/tab_thumb_sel.gif";
		
		tab_newphotos_out = new Image();
		tab_newphotos_out.src = "images_tabs/tab_newphotos_out.gif";
		tab_newphotos_over = new Image();
		tab_newphotos_over.src = "images_tabs/tab_newphotos_over.gif";
		tab_newphotos_sel = new Image();
		tab_newphotos_sel.src = "images_tabs/tab_newphotos_sel.gif";
		
		tabspdet_out = new Image();
		tabspdet_out.src = "images_tabs/tabspdet_out.gif";
		tabspdet_over = new Image();
		tabspdet_over.src = "images_tabs/tabspdet_over.gif";
		tabspdet_sel = new Image();
		tabspdet_sel.src = "images_tabs/tabspdet_sel.gif";
		
		tab_bktothumb_out = new Image();
		tab_bktothumb_out.src = "images_tabs/tab_bktothumb_out.gif";
		tab_bktothumb_over = new Image();
		tab_bktothumb_over.src = "images_tabs/tab_bktothumb_over.gif";
		tab_bktothumb_sel = new Image();
		tab_bktothumb_sel.src = "images_tabs/tab_bktothumb_sel.gif";
		
		tab_gotospchk_out = new Image();
		tab_gotospchk_out.src = "images_tabs/tab_gotospchk_out.gif";
		tab_gotospchk_over = new Image();
		tab_gotospchk_over.src = "images_tabs/tab_gotospchk_over.gif";
		tab_gotospchk_sel = new Image();
		tab_gotospchk_sel.src = "images_tabs/tab_gotospchk_sel.gif";
		
		tab_bktosrchres_out = new Image();
		tab_bktosrchres_out.src = "images_tabs/tab_bktosrchres_out.gif";
		tab_bktosrchres_over = new Image();
		tab_bktosrchres_over.src = "images_tabs/tab_bktosrchres_over.gif";
		tab_bktosrchres_sel = new Image();
		tab_bktosrchres_sel.src = "images_tabs/tab_bktosrchres_sel.gif";
		
		tab_locmap_out = new Image();
		tab_locmap_out.src = "images_tabs/tab_locmap_out.gif";
		tab_locmap_over = new Image();
		tab_locmap_over.src = "images_tabs/tab_locmap_over.gif";
		tab_locmap_sel = new Image();
		tab_locmap_sel.src = "images_tabs/tab_locmap_sel.gif";
		
		tab_weblnk_out = new Image();
		tab_weblnk_out.src = "images_tabs/tab_weblnk_out.gif";
		tab_weblnk_over = new Image();
		tab_weblnk_over.src = "images_tabs/tab_weblnk_over.gif";
		tab_weblnk_sel = new Image();
		tab_weblnk_sel.src = "images_tabs/tab_weblnk_sel.gif";
		
		tab_contact_out = new Image();
		tab_contact_out.src = "images_tabs/tab_contact_out.gif";
		tab_contact_over = new Image();
		tab_contact_over.src = "images_tabs/tab_contact_over.gif";
		tab_contact_sel = new Image();
		tab_contact_sel.src = "images_tabs/tab_contact_sel.gif";
		
		tab_advsrch_out = new Image();
		tab_advsrch_out.src = "images_tabs/tab_advsrch_out.gif";
		tab_advsrch_over = new Image();
		tab_advsrch_over.src = "images_tabs/tab_advsrch_over.gif";
		tab_advsrch_sel = new Image();
		tab_advsrch_sel.src = "images_tabs/tab_advsrch_sel.gif";	
		
		tab_srchres_out = new Image();
		tab_srchres_out.src = "images_tabs/tab_srchres_out.gif";
		tab_srchres_over = new Image();
		tab_srchres_over.src = "images_tabs/tab_srchres_over.gif";
		tab_srchres_sel = new Image();
		tab_srchres_sel.src = "images_tabs/tab_srchres_sel.gif";
		
		tab_refinesrch_out = new Image();
		tab_refinesrch_out.src = "images_tabs/tab_refinesrch_out.gif";
		tab_refinesrch_over = new Image();
		tab_refinesrch_over.src = "images_tabs/tab_refinesrch_over.gif";
		tab_refinesrch_sel = new Image();
		tab_refinesrch_sel.src = "images_tabs/tab_refinesrch_sel.gif";
		
		loaded = 1;
	}
}
PreLoadImages();

function swapImages(imgName, imgButton){
	if(loaded==1){
		imgName.src = imgButton.src;
	}
}