function showhide(layer_ref) { 
	if (document.getElementById) {
		var temp_layer = document.getElementById( layer_ref );
		if(temp_layer.style.display == 'none'){
			temp_layer.style.display = 'block';
		} else {
			temp_layer.style.display = 'none'
		}	
	} 
}
function Scroller(id) {
	if (!id)
		return false;
	var scroller = this;
	this.getElement = function() {
		return document.getElementById(id);
	};
	this.pageURL = "?page=";
	this.pageNumber = 1;
	this.lastPage = false;
	this.intervalId = null;
	this.previousScroll = -1;
	this.scroll = function(direction) {
		scroller.getElement().scrollLeft = scroller.getElement().scrollLeft + (direction * ((window.innerWidth || document.body.clientWidth) - 100));
		if (scroller.getElement().scrollLeft == scroller.previousScroll || (scroller.previousScroll == -1 && scroller.getElement().scrollLeft == 0 && direction < 0)) {
			if (scroller.getElement().scrollLeft == 0)
				document.location = this.pageURL + Math.max(1, (this.pageNumber - 1)) + "&startright=true";
			else {
				if (!scroller.lastPage)
					document.location = this.pageURL + (this.pageNumber + 1);
				else
					document.getElementById("pijlrechts").style.display = "none";
			}
		}
		else if (scroller.previousScroll == -1 && document.location.search.indexOf('&startright=true') > -1 && direction > 0)
			document.location = this.pageURL + (this.pageNumber + 1);
		if (scroller.getElement().scrollLeft == 0 && scroller.pageNumber <= 1)
			document.getElementById("pijllinks").style.display = "none";
		else if (scroller.previousScroll <= 0 && direction > 0)
			document.getElementById("pijllinks").style.display = "block";
		scroller.previousScroll = scroller.getElement().scrollLeft;
		if (direction < 0 && scroller.lastPage)
			document.getElementById("pijlrechts").style.display = "block";
	};
	this.scrollRight = function() {
		if (document.location.search.indexOf("&startright=true") > -1 && scroller.previousScroll == -1)
			scroller.getElement().scrollLeft = scroller.getElement().scrollWidth;
	};
}