function register(f) {    
	  if (!isNotEmpty(f.last_name))
	  {
		alert('请输入您的姓 / Please enter your last name!');
		return false;
	  }
	  else  if (!isNotEmpty(f.first_name))
	  {
		alert('请输入您的名 / Please enter your first name!');
		return false;
	  }
	  else  if (f.appellative.value=="")
	  {
		alert('请选择您的称呼 / Please enter your appellative!');
		return false;
	  }
	  
	  if (!isNotEmpty(f.email))
	  {
		alert('请输入您的邮箱 / Please enter email!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('请输入您正确的邮箱 / Please enter the correct email!');
			 return false;
		  }
	  }
	  
	  
	  if (!isNotEmpty(f.telephone))
	  {
		alert('请输入您电话 / Please enter telephone!');
		return false;
	  } 
	  else  if (!isNotEmpty(f.password))
	  {
		alert('请输入密码 / Please enter password!');
		return false;
	  }else if(f.password.value.length<6){
		alert('至少6位字 / Six-character minimum!');
		return false; 
	  }else  if (!isNotEmpty(f.confirm_password))
	  {
		alert('请输入确认密码 / Please enter Confirm password!');
		return false;
	  } 
	  else  if (f.password.value!=f.confirm_password.value)
	  {
		alert('密码与确认密码不匹配 / Confirm password doesn’t match the password');
		return false;
	  } 
	  
	  if (f.year.value=="")
	  {
		alert('请输入年份 / Please enter your year!');
		return false;
	  }else if (f.month.value=="")
	  {
		alert('请输入月份 / Please enter your month!');
		return false;
	  }else if (f.day.value=="")
	  {
		alert('请输入日期 / Please enter your day!');
		return false;
	  }

}
function update(f) {    
	  if (!isNotEmpty(f.last_name))
	  {
		alert('请输入您的姓 / Please enter your last name!');
		return false;
	  }
	  else  if (!isNotEmpty(f.first_name))
	  {
		alert('请输入您的名 / Please enter your first name!');
		return false;
	  }
	  
	  if (!isNotEmpty(f.email))
	  {
		alert('请输入您的邮箱 / Please enter email!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('请输入您正确的邮箱 / Please enter the correct email!');
			 return false;
		  }
	  }
	  
	  
	  if (!isNotEmpty(f.telephone))
	  {
		alert('请输入您电话 / Please enter telephone!');
		return false;
	  } 
	  if(isNotEmpty(f.password)){
		  if (!isNotEmpty(f.oldpassword))
		  {
			alert('请输入旧密码 / Please enter Past password!');
			return false;
		  }else if (!isNotEmpty(f.password))
		  {
			alert('请输入密码 / Please enter password!');
			return false;
		  }else if(f.password.value.length<6){
			alert('至少6位字 / Six-character minimum!');
			return false; 
		  }
		  else  if (!isNotEmpty(f.confirm_password))
		  {
			alert('请输入确认密码 / Please enter Confirm password!');
			return false;
		  } 
		  else  if (f.password.value!=f.confirm_password.value)
		  {
			alert('密码与确认密码不匹配 / Confirm password doesn’t match the password');
			return false;
		  } 
	  }
	  
	  if (f.year.value=="")
	  {
		alert('请输入年份 / Please enter your year!');
		return false;
	  }else if (f.month.value=="")
	  {
		alert('请输入月份 / Please enter your month!');
		return false;
	  }else if (f.day.value=="")
	  {
		alert('请输入日期 / Please enter your day!');
		return false;
	  }

}
function index_login_cn(f) {    
	  
	  if (!isNotEmpty(f.username))
	  {
		alert('请输入用户名!');
		return false;
	  }else if (!isNotEmpty(f.password))
	  {
		alert('请输入密码!');
		return false;
	  } 
}
function index_login_en(f) {    
	  
	  if (!isNotEmpty(f.username))
	  {
		alert('Please enter username!');
		return false;
	  }else if (!isNotEmpty(f.password))
	  {
		alert('Please enter psssword!');
		return false;
	  } 
}
function login(f) {    
	  
	  if (!isNotEmpty(f.username))
	  {
		 alert('请输入用户名 / Please enter username!');
		 return false;
	  }else if (!isNotEmpty(f.password))
	  {
		 alert('请输入密码 / Please enter psssword!');
		 return false;
	  } 


}
function enewsletter(f) {    
	  if (!isNotEmpty(f.last_name))
	  {
		alert('请输入您的姓 / Please enter your last name!');
		return false;
	  }
	  else  if (!isNotEmpty(f.first_name))
	  {
		alert('请输入您的名 / Please enter your first name!');
		return false;
	  }
	  
	  if (!isNotEmpty(f.email))
	  {
		alert('请输入您的邮箱 / Please enter email!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('请输入您正确的邮箱 / Please enter the correct email!');
			 return false;
		  }
	  }	  
	  
	  if (!isNotEmpty(f.telephone))
	  {
		alert('请输入您电话 / Please enter telephone!');
		return false;
	  }else if (f.year.value=="")
	  {
		alert('请输入年份 / Please enter your year!');
		return false;
	  }else if (f.month.value=="")
	  {
		alert('请输入月份 / Please enter your month!');
		return false;
	  }else if (f.day.value=="")
	  {
		alert('请输入日期 / Please enter your day!');
		return false;
	  }
}
function ContactUs_cn(f) {    
	  
	  if (!isNotEmpty(f.contact))
	  {
		 alert('请输入联系人!');
		 return false;
	  }
	  
	  if (!isNotEmpty(f.email))
	  {
		alert('请输入您的邮箱!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('请输入您正确的邮箱!');
			 return false;
		  }
	  }	  
	  
	  if (!isNotEmpty(f.subject))
	  {
		 alert('请输入主题!');
		 return false;
	  }
	  
	  if (!isNotEmpty(f.context))
	  {
		 alert('请输入内容!');
		 return false;
	  }
}
function ContactUs_en(f) {    
	
	  if (!isNotEmpty(f.contact))
	  {
		 alert('Please enter contact!');
		 return false;
	  }
	  
	  if (!isNotEmpty(f.email))
	  {
		alert('Please enter email!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('Please enter the correct email!');
			 return false;
		  }
	  }	  
	  
	  if (!isNotEmpty(f.subject))
	  {
		 alert('Please enter subject!');
		 return false;
	  }
	  
	  if (!isNotEmpty(f.context))
	  {
		 alert('Please enter context!');
		 return false;
	  }
}
function forgotPassword(f) {    
	
	  if (!isNotEmpty(f.email))
	  {
		alert('请输入您的邮箱 / Please enter email!');
		return false;
	  }else{
		  var pattern = /^[\w]\w*([-\.]\w+)*@[\w]\w*([-\.]\w+)*\.\w{2,6}$/i;
		  var email=f.email.value;
		  flag = pattern.test(email);
		  if(flag === false){
			 alert('请输入您正确的邮箱 / Please enter the correct email!');
			 return false;
		  }
	  }	   

}