Can someone help me with this problem?

Someone fills in my form. One field on the form is galleryurl. Here he types a url 
with some pictures on it. On this page the are thumbnail with links to bigger pictures.
Now I want to check if the pictures are realy on it. And I want to check if there is a 
link to a picture on the thumbnail and not to a html page.

I hope someone can help me.


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