javascript is not up to par for creating a link.

personally, when I see one I turn up my nose and go to another site. javascript only works right for navigational enhancements attached to images that are also normal links.

but, if it's in a link, and you don't want them to change the values, and you need the values in your script, maybe a local config file would be a better approach? If you use mod_perl you can use fake url directories as keys into your config files, if you need to have different settings based refering site.

and at that point, it's really easy to just tuck the config into a database instead of in files.
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