function over(item) {
if(document.images) {
	elem = document.images[item];
	elem.src = "images/navf_"+item+".gif";
}
}

function uit(item) {
if(document.images) {
	elem = document.images[item];
	if(focus==item) {
		elem.src = "images/navf_"+item+".gif";
	} else {
		elem.src = "images/nav_"+item+".gif";
	}
}
}

function plaatsplayer(url) {
document.write("<object id=\"MediaPlayer1\" width=\"180\" height=\"50\" classid=\"CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95\" codebase=\"http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701\" type=\"application/x-oleobject\" align=\"middle\">");
document.write("<param name=\"FileName\" value=\"http://www.stompe-toren.nl/sounds/go.m3u?url="+url+"\">");
document.write("<param name=\"AutoStart\" value=\"False\">");
document.write("<param name=\"ShowStatusBar\" value=\"True\">");
document.write("<param name=\"DefaultFrame\" value=\"mainFrame\">");
document.write("<embed type=\"application/x-mplayer2\" pluginspage=\"http://www.microsoft.com/Windows/MediaPlayer/\" src=\"http://www.stompe-toren.nl/sounds/go.m3u?url="+url+"\" align=\"middle\" width=\"180\" height=\"50\" showstatusbar=\"true\"></embed>");
document.write("</object>");
}

var popupje;

function popup_sound(url) {
naam="popupsound";
wijdte="250";
hoogte="150";
linkst="100";
boven="100";
scrollen="no";
instellingen = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+scrollen+',resizable=no,width='+wijdte+',height='+hoogte+',left='+linkst+',top='+boven;
if(popupje) {
	popupje.close();
}
popupje=window.open(url, naam, instellingen);
}

function popup_video(url) {
naam="popupvideo";
wijdte="640";
hoogte="530";
linkst="100";
boven="100";
scrollen="no";
instellingen = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+scrollen+',resizable=no,width='+wijdte+',height='+hoogte+',left='+linkst+',top='+boven;
if(popupje) {
	popupje.close();
}
popupje=window.open(url, naam, instellingen);
}

function emailvalidation(entered) {
with (entered) {
	apos=value.indexOf("@"); 
	dotpos=value.lastIndexOf(".");
	lastpos=value.length-1;
	if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) {
		return false;
	} else {
		return true;
	}
}
}

function checkformulier_algemeen(formulier) {
basismelding = "Controleer de volgende velden:\r\n\r\n";
melding = basismelding;
with(formulier) {
	if(naam.value=="") {melding += "- Uw naam\r\n"}
	if(emailadres.value=="" && telefoonnummer.value=="") {melding += "- E-mailadres en/of telefoonnummer\r\n"} else {
		if(emailadres.value!="" && emailvalidation(emailadres)==false) {melding += "- Uw e-mailadres\r\n";}
		if(telefoonnummer.value!="" && telefoonnummer.value.length<10) {melding += "- Uw telefoonnummer\r\n";}
	}
}
if(melding!=basismelding) {alert(melding); return false;}
}