(function(){
	function confirm_click(event)
	{
		if (confirm('Jesteś pewien?'))
			return;
		if (event && event.preventDefault)
			event.preventDefault();
		else
			window.event.returnValue = false;
	}

	function handle_element(element)
	{
		if (window.addEventListener)
			element.addEventListener('click', confirm_click, false);
		else if (window.attachEvent)
			element.attachEvent('onclick', confirm_click);
		element.style.visibility = 'visible';
	}

	function attach_confirmation()
	{
		if (document.querySelectorAll) {
			var links = document.querySelectorAll('a.confirm');
			for (var i = 0; i < links.length; ++i)
				handle_element(links[i]);
		} else {
			var links = document.getElementsByTagName('a');
			for (var i = 0; i < links.length; ++i) {
				if (links[i].className == 'confirm')
					handle_element(links[i]);
			}
		}
	}

	if (window.addEventListener)
		window.addEventListener('DOMContentLoaded', attach_confirmation, false);  
	else if (window.attachEvent)
		window.attachEvent('onload', attach_confirmation);
})();