function ValidityFeedbackForm(form1){

		if (form1.NameSender.value.length == 0){
			ErrorNameSender.innerHTML = msgNameSenderLength;//'Moi ban cung cap thong tin';
			form1.NameSender.focus();
			return false;
		}else ErrorNameSender.innerHTML = '';
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.NameSender,ErrorNameSender,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (regEmail.test(trim(form1.Email.value)) == false){
			ErrorEmailSender.innerHTML=msgRegEmail;//'moi ban cung cap email hop le';
			form1.Email.focus();
			return false;
		}else ErrorEmailSender.innerHTML='';
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.Email,ErrorEmailSender,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (form1.Subject.value.length == 0){
			ErrorSubject.innerHTML = msgNameSenderLength;//'Moi ban cung cap thong tin';
			form1.Subject.focus();
			return false;
		}else ErrorSubject.innerHTML = '';
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.Subject,ErrorSubject,intLimitWord,intLimitCharTextBox,false))
			return false;
		
		form1.submit();

	}