$(document).ready(function () {    
	$('.folding .foldingpart').hide();
	$('.folding .foldlink').click(function() {
		if($(this).siblings('.foldingpart').is(':hidden')){
			$(this).css('background-image', 'url(http://www.metoffice.gov.uk/climatechange/lib/template/bt_close.gif)');
			$(this).siblings('.foldingpart').slideDown();
		}else{
			$(this).css('background-image', 'url(http://www.metoffice.gov.uk/climatechange/lib/template/bt_open.gif)');
			$(this).siblings('.foldingpart').slideUp();
		}
	});
});