function check_form(){
 var nl = $("#fname").val().length;
 var cl = $("#lname").val().length;
 var pl = $("#phone").val().length;
 var email = $("#email").val();
 var el = email.length;
 if (nl < 1 || cl < 1 || pl < 1 ) {
  $("#err").html( "Fields marked with '*' cannot be blank." );
  return false;
 }
 if ( pl < 10 ){
  $("#err").html( "Invalid phone number." );
  return false;
 }
 var re = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*\.(\w{2}|(com|net|org|edu|int|mil|gov|biz|name|coop|info|pro))$/;
 if (!re.test(email)){
  $("#err").html( "Invalid email address." );
  return false;
 }
 return true;
}