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Go the tropicalfishgallery.com
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Press ALT+D to select the Web address, and press CTRL+C
to copy it to the Windows Clipboard.
This saves you from having to type it later.

Web address area on the Internet Explorer 6 toolbar
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On the Internet Explorer 6 Tools menu, click Internet
Options.
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Click the Security tab, and then click the security zone
where you want to add the site: Local intranet, Trusted
sites, or Restricted sites.
Because all sites are by default already in the Internet zone,
you cannot add Web sites to it.
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Click the Sites button. See step 5 in the image below.

Internet Options box
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In the Add this Web site to the zone box, press CTRL+V
to paste in the Web address. See step 6 in the image below.
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Click the Add button.

Trusted sites box
Note: If Internet Explorer 6 asks for confirmation, you
may be trying to add a site that is not secure. Internet Explorer
6 will accept only sites to the Trusted list that make a secure
connection-for example, secure banking or shopping sites. To identify
such a site, look for https:// in the Web address.
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If you want to add an unsecured Web site (for example, a site that
does not have https:// in the Web address), click to remove the
check in the Require server verification box
If you want to add more sites to this zone now, you can go back
to step 6 and type any additional Web addresses into the Add
this Web site to the zone box, and then click the Add
button.
Click OK twice.