I suggest taking a few minutes to read ASACP's DO's and DON'T's
What Do You Do If You Come Across Suspected CP On The Internet
What you should DO:
• Record the URL (website) address (if you got it before you left the page)
• Make notes of anything you noticed before you left the page (i.e. victim’s age)
• Report it immediately!
• Go to:
http://www.asacp.org or
www.cybertipline.com
• If you can identify the child immediately call your local FBI office
What NOT to do:
• Do not download it!
• Do not save it!
• Do not print it!
• Never forward it – NOT even to Law Enforcement or a hotline!
• Never attempt to research it yourself!
• Never attempt to seek out CP even if your purpose is for research or to report!
• Do not revisit the site – NOT for any reason (even if you want to go back to get the URL to report it)
Any of these activities are illegal and regardless of your intentions you could be legally responsible.
Source:
http://www.asacp.org/page.php?content=news&item=496