function checklogin(){

	var user_name = document.welcomeform.user_name.value;
	var user_pwd = document.welcomeform.user_pwd.value;

	if(user_name == ""){	
		alert("请输入您的用户名！");
		return false;
	}
	
	if(user_pwd == ""){		
		alert("密码不能为空！");
		return false;
	}
	
	document.welcomeform.submit();
	return true;
}

function checkreset(){
	document.welcomeform.reset();
	return true;
}