var btn_contact_us_off = new Image();	btn_contact_us_off.src = "/shared/images/merck_footer_sp/btn_contact_us_off.gif";
var btn_contact_us_over = new Image();	btn_contact_us_over.src = "/shared/images/merck_footer_sp/btn_contact_us_over.gif";
var btn_sitemap_off = new Image();		btn_sitemap_off.src = "/shared/images/merck_footer_sp/btn_sitemap_off.gif";
var btn_sitemap_over = new Image();		btn_sitemap_over.src = "/shared/images/merck_footer_sp/btn_sitemap_over.gif";
var btn_privacy_off = new Image();		btn_privacy_off.src = "/shared/images/merck_footer_sp/btn_privacy_off.gif";
var btn_privacy_over = new Image();		btn_privacy_over.src = "/shared/images/merck_footer_sp/btn_privacy_over.gif";
var btn_terms_off = new Image();		btn_terms_off.src = "/shared/images/merck_footer_sp/btn_terms_off.gif";
var btn_terms_over = new Image();		btn_terms_over.src = "/shared/images/merck_footer_sp/btn_terms_over.gif";
var btn_copyright_off = new Image();	btn_copyright_off.src = "/shared/images/merck_footer_sp/btn_copyright_off.gif";
var btn_copyright_over = new Image();	btn_copyright_over.src = "/shared/images/merck_footer_sp/btn_copyright_over.gif";
var btn_merck_off = new Image();		btn_merck_off.src = "/shared/images/merck_footer_sp/btn_merck_off.gif";
var btn_merck_over = new Image();		btn_merck_over.src = "/shared/images/merck_footer_sp/btn_merck_over.gif";