Update
Just an update on the whole Safari Enhancer thing (ver. 2.6.1 for Tiger) ...
I successfully downloaded and installed it by first placing the safari_enhancer.dmg file into my Applications folder. When I opened it I was led to the window that allowed me to set my link and visited link colors, to choose to always empty cache, etc.
However, an option to re-open in Enhancer does not appear in Safari; I have to go to the Applications folder and open the .dmg file once again. The program documentation states that the Enhancer and Safari run independently so it does not mess up the operation of Safari - probably a pretty good idea, although inconvenient!
BUT IT DOES MESS SAFARI UP IN ONE WAY: Upon logging on after my computer's been in sleep mode, re-connecting to the Internet (I have dial-up), and opening Safari, I get a message telling me that whatever site I choose to open cannot be opened. After several hours of frustration one night trying to figure out what happened, I realized that Safari was automatically selecting a proxy server for me when I had specified in Safari Advanced Preferences that I wanted to "Manually" Configure Proxies.
So each time I start Safari after logging on, I have to go to Safari Preferences -> Advanced, then I choose to change proxy settings. I then have to de-select the proxy server that it is trying to configure for me (under "Select a proxy server to configure") and apply the change before I can open a web site.
If Safari only had the preferences offered by Enhancer already built-in then I wouldn't have had to go through this mess in the first place. Just a note for any Apple programmer who by the slightest chance may be reading this.