function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImagesArray(array) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<array.length; i+=2) {
			document[array[i]].src = array[i+1];
		}
	}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}

function toggleImages() {
	for (var i=0; i<toggleImages.arguments.length; i+=2) {
		if (selected == toggleImages.arguments[i])      changeImagesArray(toggleImages.arguments[i+1]);
	}
}

var selected = '';
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		b_c_top_over = newImage("img/btm/b_contents_img/b_c_top-over.gif");
		b_c_top_down = newImage("img/btm/b_contents_img/b_c_top-down.gif");
		b_c_qa_over = newImage("img/btm/b_contents_img/b_c_qa-over.gif");
		b_c_qa_down = newImage("img/btm/b_contents_img/b_c_qa-down.gif");
		b_c_office_over = newImage("img/btm/b_contents_img/b_c_office-over.gif");
		b_c_office_down = newImage("img/btm/b_contents_img/b_c_office-down.gif");
		b_c_wayto_over = newImage("img/btm/b_contents_img/b_c_wayto-over.gif");
		b_c_wayto_down = newImage("img/btm/b_contents_img/b_c_wayto-down.gif");
		b_c_profile_over = newImage("img/btm/b_contents_img/b_c_profile-over.gif");
		b_c_profile_down = newImage("img/btm/b_contents_img/b_c_profile-down.gif");
		b_c_howto_over = newImage("img/btm/b_contents_img/b_c_howto-over.gif");
		b_c_howto_down = newImage("img/btm/b_contents_img/b_c_howto-down.gif");
		b_c_pay_over = newImage("img/btm/b_contents_img/b_c_pay-over.gif");
		b_c_pay_down = newImage("img/btm/b_contents_img/b_c_pay-down.gif");
		b_c_private_over = newImage("img/btm/b_contents_img/b_c_private-over.gif");
		b_c_private_down = newImage("img/btm/b_contents_img/b_c_private-down.gif");
		b_c_acce_over = newImage("img/btm/b_contents_img/b_c_acce-over.gif");
		b_c_acce_down = newImage("img/btm/b_contents_img/b_c_acce-down.gif");
		b_c_ghost_over = newImage("img/btm/b_contents_img/b_c_ghost-over.gif");
		b_c_ghost_down = newImage("img/btm/b_contents_img/b_c_ghost-down.gif");
		b_c_school_over = newImage("img/btm/b_contents_img/b_c_school-over.gif");
		b_c_school_down = newImage("img/btm/b_contents_img/b_c_school-down.gif");
		b_c_report_over = newImage("img/btm/b_contents_img/b_c_report-over.gif");
		b_c_report_down = newImage("img/btm/b_contents_img/b_c_report-down.gif");
		b_c_mass_over = newImage("img/btm/b_contents_img/b_c_mass-over.gif");
		b_c_mass_down = newImage("img/btm/b_contents_img/b_c_mass-down.gif");
		b_c_healing_over = newImage("img/btm/b_contents_img/b_c_healing-over.gif");
		b_c_healing_down = newImage("img/btm/b_contents_img/b_c_healing-down.gif");
		b_c_gather_over = newImage("img/btm/b_contents_img/b_c_gather-over.gif");
		b_c_gather_down = newImage("img/btm/b_contents_img/b_c_gather-down.gif");
		b_c_link_over = newImage("img/btm/b_contents_img/b_c_link-over.gif");
		b_c_link_down = newImage("img/btm/b_contents_img/b_c_link-down.gif");
		b_c_sitemap_over = newImage("img/btm/b_contents_img/b_c_sitemap-over.gif");
		b_c_sitemap_down = newImage("img/btm/b_contents_img/b_c_sitemap-down.gif");
		b_c_orac_over = newImage("img/btm/b_contents_img/b_c_orac-over.gif");
		b_c_orac_down = newImage("img/btm/b_contents_img/b_c_orac-down.gif");
		b_c_oracle_over = newImage("img/btm/b_contents_img/b_c_oracle-over.gif");
		b_c_oracle_down = newImage("img/btm/b_contents_img/b_c_oracle-down.gif");
		b_c_blog_over = newImage("img/btm/b_contents_img/b_c_blog-over.gif");
		b_c_blog_down = newImage("img/btm/b_contents_img/b_c_blog-down.gif");
		preloadFlag = true;
	}
}