javascript function validate not working

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JavaScript functions return undefined if no return value is defined.
EDIT: For your second problem, getElementById is much more reliable when manipulating DOM.

Change your validateForm() function like – 

function validateForm() {
    if (document.getElementById('cfname').value === '') {
      document.getElementById('errcfname').innerHTML = "Please enter firstname";
      return false;
    }
    return true;
}

Reference – http://javascript.crockford.com/survey.html

JavaScript does not have a void type, so every function must return a value. The default value is undefined, except for constructors, where the default return value is this.

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