How to fix image cache in magento and display it in frontend

1. images in product catalogs - Resize the image to 170x170 and save it in /media/catalog/product/cache/1/small_image/170x170/9df....e95/images/
2. thumbnail in shopping cart - Resize the image to 75x75 and save it in /media/catalog/product/cache/1/thumbnail/75x/9df....e95/images/
3. thumbnail in product view - Resize the image to 70x70 and save it in /media/catalog/product/cache/1/thumbnail/70x70/9df....e95/images/
4. thumbnail in my cart - Resize the image to 50x50 and save it in /media/catalog/product/cache/1/thumbnail/50x50/9df....e95/images/