function isValidEmail (email, strict)
{
 if ( !strict ) email = email.replace(/^\s+|\s+$/g, '');
 if ( (/^([a-z0-9_\-]+\.)*[a-z0-9_\-]+@([a-z0-9][a-z0-9\-]*[a-z0-9]\.)+[a-z]{2,4}$/i).test(email) )
  {
	  return true;
	  } else
	  {
		 return false;
		  }
}

function valid() {



if(document.getElementById('fio').value=="") {
	document.getElementById('fio').style.border="1px red solid";
	document.getElementById('fio_er').innerHTML="заполните поле";
	return false;
	}
	else
	{
	document.getElementById('fio').style.border="none";
	document.getElementById('fio_er').innerHTML="";
		}
if(document.getElementById('tel').value=="") {
	document.getElementById('tel').style.border="1px red solid";
	document.getElementById('phone_er').innerHTML="заполните поле";
	return false;
	}	else
	{
	document.getElementById('tel').style.border="none";
	document.getElementById('phone_er').innerHTML="";
		}

if (document.getElementById('email').value!=='') { 
if( (isValidEmail(document.getElementById('email').value)==false)) {
	document.getElementById('email').style.border="1px red solid";
	document.getElementById('email_er').innerHTML="введите корректный email";
	return false;
	}	else
	{
	document.getElementById('email').style.border="none";
	document.getElementById('email_er').innerHTML="";
		}
}
if(document.getElementById('address').value=="") {
	document.getElementById('address').style.border="1px red solid";
	document.getElementById('address_er').innerHTML="заполните поле";
	return false;
	}	else
	{
	document.getElementById('address').style.border="none";
	document.getElementById('address_er').innerHTML="";
		}


return true;

}