Find High resolution image in url

We have URLs which include an image. You can click on the image to zoom in, so we assume there is a way to find the High resolution image within the code of each url. we just try to find out how ... ? we need the way to do it, not just the image, because we want to do it again on same type of image. the images are on the left side of these URL , for example... http://www.partycity.com/product/mickey+mouse+54in+x+102in+plastic+[login to view URL] or http://www.partycity.com/product/pink+paw+patrol+table+[login to view URL] DO NOT RESPOND IF YOU ARE NOT 100% SURE. EASY project. just give us the trick and make $10.