function validate() {

	if(enquiry_form.name.value == "") {
	  alert("You must specify your name");
	  return false;
	}
	else if((enquiry_form.phone.value == "") && (enquiry_form.email.value == "")){
	  alert("You must write your email address or phone number");
	  return false;
	}
    
        return true;
}