FIXING MY VIRTUEMART/JOOMLA STORE

I HAVE A JOOMLA WEBSITE WITH A SMALL VIRTUEMART SHOP WITHIN IT, BUT I HAVE ACCIDENTALLY BROKEN PARTS OF THE VIRTUEMART AND NEED SOMEBODY WITH KNOWLEDGE TO FIX IT. THIS MAY BE A SMALL JOB, BUT I AM TOTALLY NEW TO VIRTUEMART AND REQUIRE HELP. THE WEBSITE IS: www.LakelandSpokes.co.uk

THE EXTRA IMAGES DON'T SHOW UP ANY MORE WHEN I CLICK A PRODUCT AND THE "BUY NOW" BUTTON HAS STOPPED WORKING... IT WAS WORKING PERFECTLY A FEW WEEKS AGO, BUT I MUST HAVE MADE AN ERROR. PLEASE HELP.