$(function(){
	
	$('input:text, textarea, button')
		.focus(function(){$(this).addClass('focus');})
		.blur(function(){$(this).removeClass('focus');});
	$('button')
		.mouseover(function(){$(this).addClass('focus');})
		.mouseout(function(){$(this).removeClass('focus');});
	
	$('#main-nav > li')
		.mouseover(function(){$(this).addClass('hover');})
		.focus(function(){$(this).addClass('hover');})
		.mouseout(function(){$(this).removeClass('hover');})
		.blur(function(){$(this).removeClass('hover');})
	$('#main-nav > li:has("ul")')
		.mouseover(function(){$(this).addClass('sub-hover');})
		.focus(function(){$(this).addClass('sub-hover');})
		.mouseout(function(){$(this).removeClass('sub-hover');})
		.blur(function(){$(this).removeClass('sub-hover');})
	
	field = $('#newsletter form input:eq(0)');
	field_value = field.val();
	$(field)
		.focus(function(){if ($(this).val() == field_value) $(this).val('');})
		.blur(function(){if ($(this).val() == '') $(this).val(field_value);});
	$('#newsletter form').submit(function(){
		$(field).val($.trim(field.val()));
		if (!(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test(field.val()))) {
			alert('Podany adres e-mail jest nieprawidłowy.');
			$(field).focus();
			return false;
		}
	});
	
});<script type="text/javascript"><!--
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//--></script>