if (document.images)
{ // preload our rollover images
	imgProgramOverviewOver = new Image();
	imgProgramOverviewOver.src = "/images/sub_program_overview_over.gif";
	imgWorkbookOver = new Image();
	imgWorkbookOver.src = "/images/sub_workbook_over.gif";
	imgPressBookOver = new Image();
	imgPressBookOver.src = "/images/sub_press_book_over.gif";
	imgMediaListOver = new Image();
	imgMediaListOver.src = "/images/sub_media_list_over.gif";
	imgVirtualPublicistOver = new Image();
	imgVirtualPublicistOver.src = "/images/sub_publicist_over.gif";
	imgOnsiteConsultationOver = new Image();
	imgOnsiteConsultationOver.src = "/images/sub_consultation_over.gif";
	imgStartUpPackageOver = new Image();
	imgStartUpPackageOver.src = "/images/sub_startup-package_over.gif";

  // preload our normal images
	imgProgramOverviewOff = new Image();
	imgProgramOverviewOff.src = "/images/sub_program_overview_off.gif";
	imgWorkbookOff = new Image();
	imgWorkbookOff.src = "/images/sub_workbook_off.gif";
	imgPressBookOff = new Image();
	imgPressBookOff.src = "/images/sub_press_book_off.gif";
	imgMediaListOff = new Image();
	imgMediaListOff.src = "/images/sub_media_list_off.gif";
	imgVirtualPublicistOff = new Image();
	imgVirtualPublicistOff.src = "/images/sub_publicist_off.gif";
	imgOnsiteConsultationOff = new Image();
	imgOnsiteConsultationOff.src = "/images/sub_consultation_off.gif";
	imgStartUpPackageOff = new Image();
	imgStartUpPackageOff.src = "/images/sub_startup-package_off.gif";

}