Is it possible to add pre-loading image in image gallery javascript?

Q: Is there anyway to insert a image or something into the code which will put a pre-loading image or something similar in before the picture loads? At the moment my images load fine but they take a while to come up. I just want something to make people aware that the file is loading. Please let me know.

A: Actually we already use 'loading.gif' image to show before the picture loads.
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