function ValidityRegisterERForm(form1){
		var strErr='';
		var regNum=/^\d+$/
		var reg1 = /^\w+$/;
		var regEmail =/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/
		var un = form1.UserName.value;
		var p  = form1.Password.value;
		var rp = form1.RePassword.value;
		var n  = form1.CoName.value;
		var e  = trim(form1.Email.value);
		var a  = form1.Address.value;
		var f  = form1.Phone.value;
		if (!reg1.test(un)){
			UserNameError.innerHTML = msgLoginUserName;//'Ten tai khoan cua ban chua ki tu khong hop le.(chi bao gom chu cai, chu so hoac ki tu _ va lien tiep nhau)';
			form1.UserName.focus();
			return false;
		}
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.UserName,UserNameError,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (un.length < 6 ){
			UserNameError.innerHTML= msgLoginUserNameLength;//'Ten tai khoan phai bao gom it nhat 6 ki tu'
			form1.UserName.focus();			
			return false;
		}else UserNameError.innerHTML= ''
		if (p.length < 6){
			PasswordError.innerHTML= msgLoginPasswordLength;//'Mat khau phai bao gom it nhat 6 ki tu'
			form1.Password.focus();
			return false;
		}else PasswordError.innerHTML= ''
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.Password,PasswordError,intLimitWord,intLimitCharTextBox,false))
			return false;
		if(p != rp){
			RePasswordError.innerHTML= msgRePassword;//'Mat khau nhac lai khong don nhat'
			form1.RePassword.focus();			
			return false;
		}else RePasswordError.innerHTML= ''		
		if (regEmail.test(e) == false){
			EmailError.innerHTML= msgRegEmail;//'Moi ban cung cap email dung'
			form1.Email.focus();			
			return false;		
		}else EmailError.innerHTML =''
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.Email,EmailError,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (n.length == 0 ){
			CoNameError.innerHTML= msgNameSenderLength;//'Moi ban cung cap thong tin.'
			form1.CoName.focus();
			return false;
		}else CoNameError.innerHTML = ''
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.CoName,CoNameError,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (a.length == 0){
			AddressError.innerHTML=msgNameSenderLength;// 'Moi ban cung cap thong tin. '
			form1.Address.focus();			
			return false;			
		}else AddressError.innerHTML =''
		//var intLimitCharListBox =10;
		//var intLimitCharTextBox =2;
		if(checkControlLimit(form1.Address,AddressError,intLimitWord,intLimitCharTextBox,false))
			return false;
		if (form1.Locate.value == 0){
			LocateError.innerHTML= msgNameSenderLength;//'Moi ban cung cap thong tin. '
			form1.Locate.focus();
			return false;			
		}else LocateError.innerHTML = ''		
/*		
		if (f.length == 0 ){
			PhoneError.innerHTML= msgNameSenderLength;//'Moi ban cung cap thong tin. '
			form1.Phone.focus();
			return false;
		}else PhoneError.innerHTML = ''
*/		
		form1.submit();
	}