Create customized bookmark in IE

Let's say, I have a URL of the form

http://mySite.com/?param=123

Now the page shows diff content based on the "param" value..

So can I create a bookmark in IE such that as soon as I click it in开发者_开发百科 the Favorites bar, it will prompt to enter this value (e.g 123) and then directly append it to the URL and take me to that page..

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Yes, with a bookmarklet. http://en.wikipedia.org/wiki/Bookmarklet

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If http://mySite.com/ (no parameters) has that prompt in it, then you could simply bookmark that URL.