function check(){
	var username = document.form1.userName.value;
	var question = document.form1.question.value;
	var answer = document.form1.answer.value;
	if(username == ""){
		alert("请输入用户名!");
		return false;
	}
	if(question == "0"){
		alert("请选择提示问题!");
		return false;
	}
	if(answer == ""){
		alert("请输入问题答案!");
		return false;
	}
}