<script type="text/javascript">
function toggle(obj) {
	var el = document.getElementById(obj);
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = 'none';
	}
}
</script>
<div id="deneme">
<a onclick="javascript:toggle('deneme')">yoket</a>
</div>