var oldpage;
var ready = true;

function textbox(pagename) {
	if(ready == true) {
		ready = false;
		var page = document.getElementById('textbox_' + pagename);
		var content = document.getElementById('textbox');
		var fx = new Fx.Style(content, 'height', {wait: false, duration: 500, transition: Fx.Transitions.Sine.easeInOut});
		if(content.getStyle('height').toInt() > 0) { // Textbox open
			fx.start(282, 0).chain(function(){
				var old = document.getElementById('textbox_' + oldpage);
				ready = true;
				old.style.display = "none";
				content.style.borderBottom = "0px solid #BFBFBD";
				if(oldpage != pagename && pagename != null) {
					textbox(pagename);
				}
				oldpage = pagename;
			});
		} else { // Textbox is gesloten, gaat open 
			if(document.getElementById('imageslider') == null) { content.style.borderBottom = "1px solid #BFBFBD"; }
			fx.start(0, 282).chain(function(){
				ready = true;
			});
			page.style.display = "block";
			oldpage = pagename;
		}
	}
}