I'm been trying to validate my fields by using 'getElementById()' with '.value'. However, it seems like either getElementById.value is not working or some codes has overlap the function.

Updated Javascript function:

function validate() {

    var Name = document.getElementById('Name').value;

    var Tel = document.getElementById('Tel').value;

    var FaxNo = document.getElementById('FaxNo').value;

    if (Name != ) //wanted to check for alphabets only.

    {

         alert(Correct);

         return true; //doesnt go to next.php

    }

    else 

    {

          alert(Don leave blank!)

          return false;

    }

    if (isNaN(Tel)) //check only numbers. Same code for FaxNo.

    {

        alert(Correct);

        return true; //doesnt go to next.php

    }

    else 

    {

      alert(invalid);

      return false

    }



  return true; //doesn't go to next.php

}

My Form:

<Form action =next.php method=post>

<input name=Name type=text id=Name value=/>

<input name=Tel type=text id=Tel value=/>

<input name=FaxNo type=text id=FaxNo value=/>

<input type=submit name=submit onclick=return validate();/>

</Form>

I have already defined my onclick function to my Javascript and tried to add return false too. But the alert still cant appear. Kindly advise.