I don't think it's a problem with the code per say, it's more a question to iPad users because I actually have difficulty finding how to get from google images to getting the address for that image.
For example, see a pic on google image search, hold down my finger on that pic and it'll say like http://imagesearch.com/image name here/random number but then when I click the image because you can't copy that bit the URL on the URL is just imagesearch.com/image name here/random number and if I try adding the http:// manually it doesn't work :s
Hope that made sense