var GlobalError=false;

function ValidCharCheck(val){
  var ok = "1234567890qwertyuiopasdfghjklzxcvbnm.-_QWERTYUIOPASDFGHJKLZXCVBNM";
  for (i=0; i < val.length ;i++){
    if (ok.indexOf(val.charAt(i))<0) return false;
   } 
  return true;
}

function checkemail(el){
  var str=el.value
  var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
  if (filter.test(str)){
   return true;
  } else {
   return false;
  }
}
function CheckFullName(){
  CheckFname();
  CheckLname();
}

function CheckFname(){
  if (document.getElementById('Fname').value=='' || document.getElementById('Fname').value.length<1){
    GlobalError=true;
    document.getElementById('Fname').style.backgroundColor='#FF0000';
    document.getElementById('FnameErr').style.visibility='visible';
  }
}

function CheckLname(){
  if (document.getElementById('Lname').value.length<1){
    GlobalError=true;
    document.getElementById('Lname').style.backgroundColor='#FF0000';
    document.getElementById('LnameErr').style.visibility='visible';
  }
}

function CheckInputPassword(){
  if (document.getElementById('Password').value !=document.getElementById('ConfPassword').value) PasswordConfirmError();
  if (document.getElementById('Password').value=='') return;
  
  if ( !ValidCharCheck(document.getElementById('Password').value) || 
      !CheckLength(document.getElementById('Password').value)) PasswordError();
}
function CheckPassword(){
  if (document.getElementById('Password').value=='') PasswordError();
  if ( !ValidCharCheck(document.getElementById('Password').value) || 
      !CheckLength(document.getElementById('Password').value)) PasswordError();
}
function CheckUsername(){
  if (document.getElementById('Username').value=='') UsernameError();
  if ( !ValidCharCheck(document.getElementById('Username').value) || 
      !CheckLength(document.getElementById('Username').value)) UsernameError();
}
  
function EmailError(){
  GlobalError=true;
  document.getElementById('Email').value='';
  document.getElementById('Email').style.backgroundColor='#FF0000'
  document.getElementById('EmailErr').style.visibility='visible';
}
function UsernameError(){
  GlobalError=true;
  document.getElementById('Username').value='';
  document.getElementById('Username').style.backgroundColor='#FF0000'
  document.getElementById('UsernameErr').style.visibility='visible';
}

function PasswordError(){
  GlobalError=true;
  document.getElementById('Password').style.backgroundColor='#FF0000'
  if (document.getElementById('ConfPassword')) document.getElementById('ConfPassword').style.backgroundColor='#FF0000'
  document.getElementById('PassErr').innerHTML='Invalid Password. Passwords are between 4 and 16 characters (letters and numbers)';
  document.getElementById('PassErr').style.visibility='visible';
  document.getElementById('Password').value='';
  if (document.getElementById('ConfPassword')) document.getElementById('ConfPassword').value='';
}
function PasswordConfirmError(){
  GlobalError=true;
  document.getElementById('Password').style.backgroundColor='#FF0000'
  document.getElementById('ConfPassword').style.backgroundColor='#FF0000'
  document.getElementById('PassErr').style.visibility='visible';
  document.getElementById('PassErr').innerHTML='The "Password" and the "Confirm Password" fields do not match.';
  document.getElementById('Password').value='';
  if (document.getElementById('ConfPassword')) document.getElementById('ConfPassword').value='';
}

function ResetErrorMessages(){
  GlobalError=false;
  if (document.getElementById('Fname')) document.getElementById('Fname').style.backgroundColor='';
  if (document.getElementById('Lname')) document.getElementById('Lname').style.backgroundColor='';
  if (document.getElementById('Email')) document.getElementById('Email').style.backgroundColor='';
  if (document.getElementById('Password')) document.getElementById('Password').style.backgroundColor='';
  if (document.getElementById('ConfPassword')) document.getElementById('ConfPassword').style.backgroundColor='';
  if (document.getElementById('Username')) document.getElementById('Username').style.backgroundColor='';
  if (document.getElementById('FnameErr')) document.getElementById('FnameErr').style.visibility='hidden';
  if (document.getElementById('LnameErr')) document.getElementById('LnameErr').style.visibility='hidden';
  if (document.getElementById('EmailErr')) document.getElementById('EmailErr').style.visibility='hidden';
  if (document.getElementById('PassErr')) document.getElementById('PassErr').style.visibility='hidden';
  if (document.getElementById('UsernameErr')) document.getElementById('UsernameErr').style.visibility='hidden'; 
}

function CheckLength(val){
  if (val.length<4 || val.length>16) return false;
  return true;
}