inline js for show and toggle element by id. Use case, feature phone Opera Mini.

inline js for show and toggle

<script>
function toggle_visibility(id) {
 var e = document.getElementById(id);
 if(e.style.display == 'block')
    e.style.display = 'none';
 else
    e.style.display = 'block';
}

function show(id) {
 var e = document.getElementById(id);
  e.style.display = 'block';
}
</script>

<a href="#" onclick="toggle_visibility('text');">Show me!</a>

<p style="display:none;" id="text">
I'm Hidden
</p>