function check_sem_form()	{
  missingdata = "To enable us to respond to your enquiry, please provide the following information";
	missingdata += "\n--------------------------------------------------------------------------------------------------\n";
	if (document.form.FirstName.value == "") {
	  missingdata += "\n- Your First Name";
	}
	
  if (document.form.LastName.value == "") {
	  missingdata += "\n- Your Surname";
	}
	
  if (document.form.CompanyName.value == "") {
	  missingdata += "\n- Your Company Name";
	}
	
  if (document.form.BusPhone.value == "") {
	  missingdata += "\n- Your Business Phone No";
	}
	
  if ((document.form.email.value == "") || 
	    (document.form.email.value.indexValue('@') == -1) || 
			(document.form.email.value.indexValue('.') == -1)) {
	  missingdata += "\n- a valid email address";
  }
	 
  if (missingdata != "" ) {
		alert (missingdata); 
		return false;
	} 
	else  
		return true;
	}