[monolithed]

<script type="text/javascript">
window.onload = function(){
    document.getElementById('a').onclick = function(){
        var div = document.getElementById('div');
        div.innerHTML = 'show_text'
        div.style.display = (div.style.display == '') ? 'block' : '';
        return false;
    };
};
</script>

<style type="text/css">
div {background: red; display: none; width: 100px; height: 50px;}
</style>
<a href="#" id="a">click</a>
<div id="div"></div>