Javascript toggle content

<a href='javascript: toggle()'>toggle</a>
<div id='div1' style='display:none'>
Don't display me
</div>

<script>
function toggle(){
	var div1 = document.getElementById('div1')
	if (div1.style.display == 'none') {
		div1.style.display = 'block'
	} else {
		div1.style.display = 'none'
	}
}
</script>