// Makes an sblock open and close on click
// It is like
// <div>
// 	<button/>
// 	<div><span>Text</span></div>
// </div>
function doSBlock(node) {
	// Get the inner span
	firstDiv = node.getElementsByTagName('div')['0'];
	button = node.getElementsByTagName('button')['0'];
	span = firstDiv.getElementsByTagName('span')['0'];

	// Is it hidden?
	if (span.style.display == 'none') {
		// Show it and change button value
                firstDiv.className = "sblock_displayed";
		span.style.display = 'inline';
		button.innerHTML = 'Скрий';
	} else {
		// Hide it
                firstDiv.className = "sblock_hidden";
		span.style.display = 'none';
		button.innerHTML = 'Покажи';
	}
}