//function to check empty fields

//function isEmpty(first_name, last_name, email) {

function isEmpty(form) {
//change "field1, field2 and field3" to your field names
alert('inside isEmpty()');

first_name = document.form.element[0].value 
last_name = document.form.element[1].value
email = document.form.email.value

  //name field
    if (first_name == "" || first_name == null || !isNaN(strfield1) || strfield1.charAt(0) == ' ')
    {
    alert("\"Field 1\" is a mandatory field.\nPlease amend and retry.")
    return false;
    }

  //url field 
    if (last_name == "" || last_name == null || last_name.charAt(0) == ' ')
    {
    alert("\"Field 2\" is a mandatory field.\nPlease amend and retry.")
    return false;
    }

  //title field 
    if (email == "" || email == null || email.charAt(0) == ' ')
    {
    alert("\"Field 3\" is a mandatory field.\nPlease amend and retry.")
    return false;
    }
    return true;
}


//function to check valid email address
//function isValidEmail(strEmail){
function isValidEmail(form){
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
  strEmail = document.form.email.value;

   // search email text for regular exp matches
    if (strEmail.search(validRegExp) == -1) 
   {
      alert('A valid e-mail address is required.\nPlease amend and retry');
      return false;
    } 
    return true; 
}


//function that performs all functions, defined in the onsubmit event handler

function check(form)){

//if (isEmpty(contactForm.)){
//  if (isEmpty(form.field2)){
//    if (isEmpty(form)){
		if (isValidEmail(form)){
		  if(isEmpty(form)){
		  return true;
		}
	  }
return false;
}