function chk_submit(itm, itm_name) {
	chk_all = document.getElementsByClassName("chk_item");
	chk_cnt = 0;
	chk_arr = new Array();

	for( i = 0; i < chk_all.length; i++ ) {
		if( chk_all[i].checked ) {
			chk_arr.push( chk_all[i].value );
			chk_cnt++;
		}
	}
	if( chk_cnt == 0 ) {
		alert( itm_name + "を選択してください" );
		return false;
	}
	if( chk_cnt > 5 ) {
		alert( itm_name + "は５つまで選択できます" );
		return false;
	}
	document.next[itm].value = chk_arr.join(",");
	document.next.submit();

	return false;
}