function addDomain(form){
	
	var uname = '';

	/* domain name */
	//var domain = '@keiyo-cc.co.jp';
	var domain = '@keiyo-cc.co.jp';

	/* get username */
	var loginid = form.username.value;

	/* check username */
	if(loginid.match("@")){
		uname = loginid;
	}else{
		/* add domain */
		uname = loginid.concat(domain);
	}
	
	/* set new username */
	form.username.value = uname;
	
	/* for debug */
	//alert(form.username.value);

}