function changeNav(tab) {
	document.getElementById('nieuws').className = 'nav_nieuws' + tab;
	document.getElementById('profiel').className = 'nav_profiel' + tab;
	document.getElementById('werkwijze').className = 'nav_werkwijze' + tab;
	document.getElementById('typetjes').className = 'nav_typetjes' + tab;
	document.getElementById('referenties').className = 'nav_referenties' + tab;
}

function goLink(link) {
	left  = frames['iframe'].document.getElementById('marquee').style.left;
	start = left.substr(0, left.length -2);
	
	if(link.indexOf('?')) {
		href = link + '&start=' + start;
	} else {
		href = link + '?start=' + start;
	}
	
	this.location = href + '#content';
}

function setTypeId(dropdown) {
	document.getElementById('tID').value = document.getElementById(dropdown).value;
}

function changeB2(toggle) {
	if(toggle == 1) {

		document.getElementById('b2').src = 'images/b2_up.gif';
	} else {
		document.getElementById('b2').src = 'images/b2.gif';
	}
}

function changesearch(toggle) {
	if(toggle == 1) {

		document.getElementById('search').src = 'images_bg/search2.jpg';
	} else {
		document.getElementById('search').src = 'images_bg/search.jpg';
	}
}