Standard procedure for us in the company is to create a prototytpe of html5 ad (for example 300x250) and then use that one as a base for other similar formats (for example 640x480 or 800x600). We do it like this: since there are several animated elements, we group them all in a symbol, and then scale them all up, and since during the scaling images get blurry and pixelated, we replace them with bigger images with proper size. How ever, they still look blurry in Safari. This doesn;t happen when we start from the biggest image and scale images down. Did anyone have similar experience? Does anyone have an idea what other approach could be taken in creating ads with similar ratio?Thanks!