function mailFormValidate(f) {
   
   if (document.formvalidator.isValid(f)) {
      return true; 
   }else {
   	  if(typeof(f.FirstName)!="undefined" && !document.formvalidator.validate(f.FirstName)){
		alert (firstNameVerifyTxt);
		f.FirstName.focus();
		return false;
	  }
	  
   	  if(typeof(f.LastName)!="undefined" && !document.formvalidator.validate(f.LastName)){
		alert (lastNameVerifyTxt);
		f.LastName.focus();
		return false;
	  }
	  
   	  if(typeof(f.CompanyName)!="undefined" && !document.formvalidator.validate(f.CompanyName)){
		alert (companyNameVerifyTxt);
		f.CompanyName.focus();
		return false;
	  }
	  
   	  if(typeof(f.Address)!="undefined" && !document.formvalidator.validate(f.Address)){
		alert (addressVerifyTxt);
		f.Address.focus();
		return false;
	  }
	  
   	  if(typeof(f.NumberEnglishBooks)!="undefined" && !document.formvalidator.validate(f.NumberEnglishBooks)){
		alert (englishBookVerifyTxt);
		f.NumberEnglishBooks.focus();
		return false;
	  }
	  
   	  if(typeof(f.NumberChineseBooks)!="undefined" && !document.formvalidator.validate(f.NumberChineseBooks)){
		alert (chineseBookVerifyTxt);
		f.NumberChineseBooks.focus();
		return false;
	  }
	  
   	  if(typeof(f.email)!="undefined" && !document.formvalidator.validate(f.email)){
		alert(emailAddressVerifyTxt);
		f.email.focus();
		return false;
	  }
	  
   	  if(typeof(f.Organisation)!="undefined" && !document.formvalidator.validate(f.Organisation)){
		alert (organisationVerifyTxt);
		f.Organisation.focus();
		return false;
	  }
	  
   	  if(typeof(f.Message)!="undefined" && !document.formvalidator.validate(f.Message)){
		alert (messageVerifyTxt);
		f.Message.focus();
		return false;
	  }
	  
   	  if(typeof(f.verifyCode)!="undefined" && !document.formvalidator.validate(f.verifyCode)){
	  
		alert (verifyCodeVerifyTxt);
		f.verifyCode.focus();
		return false;
	  }
   }
   return false;
}