var TOCState = 'block';

function ShowHideToc() {

TOCState = (TOCState == 'none') ? 'block' : 'none';
var newText = (TOCState == 'none') ? 'Show' : 'Hide';
document.getElementById('__toc_toggle').innerHTML = newText;
document.getElementById('__toc_content').style.display = TOCState;

}