function tell_a_friend_url(){
	var myUrl=window.document.URL;
	document.getElementById('tell_name').value=myUrl;
}
function tell_a_friend_action(){
	var myUrl=window.document.URL;
	//document.getElementById('tell_a_friend_form').action=myUrl;
	var nummer=myUrl.search(/\?/);
	if(nummer=='-1'){ var query_str='?tell=true'; }
	else{ var query_str='&tell=true'; }
	document.forms['tell_a_friend'].action=myUrl+query_str;
}
function tell_a_friend_formulier(){
	
	var errs=0;	

	if(document.forms['tell_a_friend'].elements['user_naam'].value == ''){
		errs += 1;	
	}	
	if(document.forms['tell_a_friend'].elements['user_mail'].value == ''){
		errs += 1;		
	}	
	if(document.forms['tell_a_friend'].elements['betreffende_naam'].value == ''){
		errs += 1;		
	}	
	if(document.forms['tell_a_friend'].elements['betreffende_mail'].value == ''){
		errs += 1;		
	}
	if(errs==0){		
		tell_a_friend_url();
		tell_a_friend_action();
		document.getElementById('submit_tell_a_friend').disabled = false;	
	}
	else{
		document.getElementById('submit_tell_a_friend').disabled = true;
	}
}