Well, read the Creative Commons document. That should tell you under what conditions you can use the image. If you are afraid of going through the legalese, link it here.
And yeah, I wouldn’t use it unless you know that you are authorized to use it.
To be totally clear, just create an image of your own. That is the safest bet.
I think creative commons gives you the right to use it on your site, with proper credit. Anyway, why don’t you email the original author just to be certain?
i emailed author on flickr that’s his only contact address but thr’s no reply from his side may be he has left using his flickr account
and here is that image Gurgaon Skyline on Flickr - Photo Sharing!