function validate(f){
    var regex = /^\s*$/i;
      for(var i=0; i<f.elements.length; i++){
        if(regex.test(f.elements[i].value)&&f.elements[i].title.indexOf('null',0)==-1){
          alert("Please fill in the required fields.");
          f.elements[i].focus();
          return false;
       }
    }
	if(f.email.value.indexOf('@',0)==-1 || f.email.value.indexOf('.',0)==-1)
	{
		alert("You must provide a VALID email address.");
		f.email.focus();
		return false; 
	}
  return true;
}