function mail_ope(toname, toemail, fromname, fromemail) {
    url = 'mail_ope.php?toname='+toname+'&toemail='+toemail;
	if (fromname) url+='&fromname='+fromname;
	if (fromemail) url+='&fromemail='+fromemail;
    window.open(url,'mail_ope','menubar=no,width=520,height=420,scrollbars=yes');
}