function open_bedrijfsgegevens(div) {
	element = $('div_bedrijf');
	openclose = $('span_open_close');
	if(element.style.display == 'none') {
		element.style.display = '';
		openclose.innerHTML = '-';
	}else{		
		element.style.display = 'none';
		openclose.innerHTML = '+';
	}
}