function isEmpty(strfield1) {
strfield1 = document.forms[0].first_name.value 
    if (strfield1 == "" || strfield1 == null || !isNaN(strfield1) || strfield1.charAt(0) == ' ')
    {
    alert("Please provide your first name!")
    return false;
    }
    return true;
}
function isFull(strfield1) {
strfield1 = document.forms[0].phone.value
	if (strfield1 == "")
    {
alert("Please provide a contact number")
    return false;
    }
    return true;
}

function isValidEmail(strEmail){
  validRegExp = /^[^@]+@[^@]+\.[a-z]{2,}$/i;
  strEmail = document.forms[0].email.value;
    if (strEmail.search(validRegExp) == -1) 
   {
      alert('Please provide a valid email address');
      return false;
    } 
    return true; 
}
function validate(form){
if (isEmpty(form.first_name)){
		if (isValidEmail(form.email)){
			if (isFull(form.phone)){
		  		return true;
			}
		}
 }
return false;
}