var btn_home_df=new Image();
btn_home_df.src="../img_cmn/btn_home_df.gif";
var btn_home_ov=new Image();
btn_home_ov.src="../img_cmn/btn_home_ov.gif";

var btn_service_df=new Image();
btn_service_df.src="../img_cmn/btn_service_df.gif";
var btn_service_ov=new Image();
btn_service_ov.src="../img_cmn/btn_service_ov.gif";

var btn_case_df=new Image();
btn_case_df.src="../img_cmn/btn_case_df.gif";
var btn_case_ov=new Image();
btn_case_ov.src="../img_cmn/btn_case_ov.gif";

var btn_event_df=new Image();
btn_event_df.src="../img_cmn/btn_event_df.gif";
var btn_event_ov=new Image();
btn_event_ov.src="../img_cmn/btn_event_ov.gif";

var btn_recruit_df=new Image();
btn_recruit_df.src="../img_cmn/btn_recruit_df.gif";
var btn_recruit_ov=new Image();
btn_recruit_ov.src="../img_cmn/btn_recruit_ov.gif";

var btn_company_df=new Image();
btn_company_df.src="../img_cmn/btn_company_df.gif";
var btn_company_ov=new Image();
btn_company_ov.src="../img_cmn/btn_company_ov.gif";