function changeslider(){
	var imgid=parseInt(document.getElementById('sliderid').value);
	var newimgid=1;
	
	if(imgid==2){
		newimgid=1;
	}else{
		newimgid=imgid+1;
	}
	
	document.getElementById('slide'+newimgid).style.opacity=1;
	document.getElementById('slide'+imgid).style.opacity=0;
	
	document.getElementById('sliderid').value=newimgid;
	setTimeout(	function(){ changeslider(); } ,10000);
}
setTimeout(	function(){ changeslider(); } ,4000);

function changelang(){
	if (window.XMLHttpRequest){ // code for IE7+, Firefox, Chrome, Opera, Safari
		xmlsavetext=new XMLHttpRequest();
	} else { // code for IE6, IE5
		xmlsavetext=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlsavetext.onreadystatechange=function(){
		if (xmlsavetext.readyState==4 && xmlsavetext.status==200){
			location.reload();
		}
	}

	randomnumber=Math.floor(Math.random() * 999999999) + 1;
	var params = "changelang=TRUE&rand="+randomnumber;

	xmlsavetext.open("POST","/index.php",true);
	xmlsavetext.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlsavetext.send(params);
}
	
function scrollinfo(){
	var root = /firefox|trident/i.test(navigator.userAgent) ? document.documentElement : document.body
	var easeInOutCubic = function(t, b, c, d) {
		if ((t/=d/2) < 1) return c/2*t*t*t + b
			return c/2*((t-=2)*t*t + 2) + b
		}
	var startTime

	var body = document.body;
	var html = document.documentElement;
	var hoogte=Math.max(body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight );

	var startPos=0;
	if(hoogte>1300){
		scrollEndValue=390;
	}else if(hoogte>1100){
		scrollEndValue=210;
	}else{
		scrollEndValue=100;
	}
	
	var duration = 600
	var scroll = function(timestamp) {
		startTime = startTime || timestamp
		var elapsed = timestamp - startTime
		var progress = easeInOutCubic(elapsed, startPos, scrollEndValue, duration)
		root.scrollTop = progress
		elapsed < duration && requestAnimationFrame(scroll)
	}   
	requestAnimationFrame(scroll);
}