function toggle_display(nr) {
	if (document.layers) {
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = current;
	} else if (document.all)	{
		current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = current;
	} else if (document.getElementById) {
		vista = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = vista;
	}
}

function change_class(ele, classid) {
	if(ele != active1 && ele != active2 && ele != active3) {
		ele.className = classid;
	}
}

function load_nav_layer(path, target, source) {
	//var updater = new Ajax.Updater(target, main_url+work_url+'/project_inline.php', { method: 'get', parameters: 'id='+what, onComplete: update_links });
	var updater = new Ajax.Updater('nav_ebene_'+target, main_url+work_url+'/nav_dir.php', { method: 'get', parameters: 'dir='+path+'&id='+target });
	var info_panel = $('nav_ebene_3').innerHTML = '';
	
	/* color the active nav element */
	if(active1) {
		active1.className = 'lowlight';
	}
	active1 = source;
	source.className = 'highlight';
}

function load_project(path, source) {
	var updater = new Ajax.Updater('inhalt', main_url+work_url+'/inhalt.php', { method: 'get', parameters: 'name='+path });
	var updater2 = new Ajax.Updater('nav_ebene_3', main_url+work_url+'/info.php', { method: 'get', parameters: 'dir='+path });
	
	/* create the new site title */
	var tmp1 = path.split('/');
	var tmp2 = tmp1[tmp1.length-1];
	var tmp3 = tmp2.replace(/_/g, " ")
	document.title = "fieldesign.de WORK: "+tmp3;
	
	/* color the active nav element */
	if(active2) {
		active2.className = 'lowlight';
	}
	active2 = source;
	source.className = 'highlight';
}

function load_image(path, id, source) {
	var updater = new Ajax.Updater('inhalt', main_url+work_url+'/inhalt.php', { method: 'get', parameters: 'name='+path+'&id='+id });
	
	/* color the active nav element */
	if(active3) {
		active3.className = 'selector_off';
	}
	$('selector_1').className = 'selector_off'; //uncolor the default image (1)
	active3 = source;
	source.className = 'selector_on';
}

function load_text(path, source) {
	var updater = new Ajax.Updater('inhalt', main_url+work_url+'/display_text.php', { method: 'get', parameters: 'file='+path });
	$('nav_ebene_2').innerHTML = '';
	$('nav_ebene_3').innerHTML = '';
	
	/* color the active nav element */
	if(active1) {
		active1.className = 'lowlight';
	}
	active1 = source;
	source.className = 'highlight';
}

function next_image(path, id) {
	var updater = new Ajax.Updater('inhalt', main_url+work_url+'/inhalt.php', { method: 'get', parameters: 'name='+path+'&id='+id });
}