function getUrl(url, vertraging){
	setTimeout("window.location = '"+url+"'", vertraging);
}

function openUrl (url, breedte, hoogte){
	
	var openWindowX = (screen.width/2)-(breedte/2);
	var openWindowY = (screen.height/2)-25-(hoogte/2);
	var pos = "left="+openWindowX+",top="+openWindowY;
	
	openWindow = window.open(url,"Panorama","width=" + breedte + ", height=" + hoogte + "," + pos);
}

function fitWindow() {
	var NS = (navigator.appName=="Netscape")?true:false;
	iWidth = (NS)?window.innerWidth:document.body.clientWidth;
	iHeight = (NS)?window.innerHeight:document.body.clientHeight;
	
	var foto = document.getElementById("photo");
	
	iWidth = foto.width - iWidth;
	iHeight = foto.height - iHeight;
	
	var positionX = (screen.width/2)-(foto.width/2);
	var positionY = (screen.height/2)-(foto.height/2);
	
	window.moveTo(positionX, positionY);
	window.resizeBy(iWidth, iHeight-1);
	self.focus();
}

function toon_layer(id){
	//bovenmarge = Math.round(document.body.clientHeight / 2 - hoogte -170);
	//linkermarge = Math.round((document.body.clientWidth - breedte) / 2);
	
	var venster = document.getElementById(id);
	//venster.style.width = breedte + "px";
	//venster.style.height = hoogte + "px";
	//venster.style.margin = bovenmarge + "px " + linkermarge + "px " + bovenmarge + "px " + linkermarge + "px";
	venster.style.visibility = "visible";
}

function verberg_layer(id){
	var venster = document.getElementById(id);
	venster.style.visibility = "hidden";
}

function wijzigStyle (id, attr, waarde){
	var stijl = document.getElementById(id).style;
	
	switch (attr){
		case 'display':
			stijl.display = waarde;
			break;
		case 'visibility':
			stijl.visibility = waarde;
			break;
	}
}

function toggle_visibility(id){
	var venster = document.getElementById(id);
	if (venster.style.visibility == "visible"){
		venster.style.visibility = "hidden";
	}
	else if (venster.style.visibility == "hidden"){
		venster.style.visibility = "visible";
	}
}

function toggle_display(id){
	var venster = document.getElementById(id);
	if (venster.style.display == "block"){
		venster.style.display = "none";
	}
	else if (venster.style.display == "none"){
		venster.style.display = "block";
	}
}

function isChecked(id){
	item = document.getElementById(id).checked;
	return item;
}

function ledigVeld(id){
	var veld = document.getElementById(id);
	veld.value = "";
}

function vulVeld(id, waarde){
	var veld = document.getElementById(id);
	if (veld.value.length == 0){
		veld.value = waarde;
	}
}

function openPano(url, type, breedte, hoogte){
	breedte = ((breedte == 0) ? 600 : breedte);
	hoogte = ((hoogte == 0) ? 450 : hoogte);
	autosize = ((type == 'image') ? 'true' : 'false');
	
	url = 'panorama.php?type='+type+'&pano='+url+'&autosize='+autosize;
	openUrl(url, breedte, hoogte);
}