function insert_smiley(smiley) {
	document.forms[0].opmerking.value = document.forms[0].opmerking.value + ' ' + smiley;
}

function checkSubmit()	{
	if (document.forms[0].fnm.value=='' || document.forms[0].lnm.value=='' || document.forms[0].telthuis.value=='' || document.forms[0].gebdatum.value=='' ||  document.forms[0].adres.value=='' ||  document.forms[0].postcode.value=='' ||  document.forms[0].woonplaats.value=='' ) 	{ 
		alert('Voer eerst alle verplichte velden in.' ); 
		return false;
	}
	var emailaddress=document.forms[0].email.value;
	var emailFormat = /^\w(\.?[\w-])*@\w(\.?[\w-])*\.[a-zA-Z]{2,6}(\.[a-zA-Z]{2})?$/i;
	if (emailaddress.search(emailFormat) == -1)	{
		alert("Voer een geldig email adres in.");
		return false; 
	}	
}

function show_layers(A,B)	{

	var source_obj		= document.getElementById( B );
	var target_obj		= document.getElementById( A );

	source_obj.style.display		= "none";
	target_obj.style.display		= "inline";

}