function showDarkBack () {
	jQuery('#darkBack').css({'height' : jQuery(document).height(), 'opacity' : '0.7', 'display' : 'block'});
 	return false;
}

function hideDarkBack () {
	jQuery('#darkBack').css({'display' : 'none'});
}

function popUp() {
	jQuery("#hiddenBlock").css('height', jQuery(document).height());
	jQuery("#hiddenBlock").fadeIn(300, function(){});
	showDarkBack();
}

function closePopUp() {
	jQuery("#hiddenBlock").fadeOut(300, function() {
		hideDarkBack();							  
	});
	return false;
}