//contact formulier

function CheckForm () { 
	//Initialise variables
	var errorMsg = "";

	//Check for a name
	if (document.contact.naam.value == ""){
		errorMsg += "\n\tNaam\t- Vul uw naam in<br>";	
	}
	

		//Check for a telephone number
	if (document.contact.telefoon.value == ""){
		errorMsg += "\n\tTelefoon\t- Vul uw telefoonnummer in<br>";	
	}

		//Check for an e-mail address and that it is valid
	if ((document.contact.email.value == "") || (document.contact.email.value.length > 0 && (document.contact.email.value.indexOf("@",0) == - 1 || document.contact.email.value.indexOf(".",0) == - 1))) { 
		errorMsg += "\n\tEmail\t- Vul een (geldig) email adres in<br>";
	}	
		
	//If there is aproblem with the form then display an error
	if (errorMsg != ""){
		msg = "________________________________________________________________<br>\n\n";
		msg += "Uw formulier kan niet worden behandeld.<br> \n";
		msg += "Corrigeer a.u.b. de volgende velden en probeer het opnieuw.\n";
		msg += "________________________________________________________________<br>\n\n";
		msg += "De volgende problemen zijn gecontstateerd: <br> \n";
		
		errorMsg += alert(msg + errorMsg + "\n\n");
		return false;
	}
	
	return true;
}