[kuzyara]

/**
 * Quick code mouse double click handler.
 */
function quickCodeHandler(e)
{
	var target = e.target,
		highlighterDiv = findParentElement(target, '.syntaxhighlighter'),
		container = findParentElement(target, '.container'),
		textarea = document.createElement('textarea'),
		highlighter
		;

	if (!container || !highlighterDiv || findElement(container, 'textarea'))
		return;

	highlighter = getHighlighterById(highlighterDiv.id);
	
	// add source class name
	addClass(highlighterDiv, 'source');

	// Have to go over each line and grab it's text, can't just do it on the
	// container because Firefox loses all \n where as Webkit doesn't.
	var lines = container.childNodes,
		code = []
		;
	
	for (var i = 0; i < lines.length; i++)
		code.push(lines[i].innerText || lines[i].textContent);
	
	// using \r instead of \r or \r\n makes this work equally well on IE, FF and Webkit
	code = code.join('\r');
	
	// inject <textarea/> tag
	textarea.appendChild(document.createTextNode(code));
	container.appendChild(textarea);
	
	// preselect all text
	textarea.focus();
	textarea.select();
	
	// set up handler for lost focus
	attachEvent(textarea, 'blur', function(e)
	{
		textarea.parentNode.removeChild(textarea);
		removeClass(highlighterDiv, 'source');
	});
};

Вот исходник этой функции, только я всё-равно механизм не могу понять((