Two jQuery versions on the same page

Question

Is it possible to have 2 different jQuery versions in the same document, and have them to not collide with each other?

For example if I create a bookmarklet and want

Answer 1

Here is a way to detect is JQuery is already present: jQuery in widget

Work out the oldest version of JQuery your code will work with.. And refuse to work if the version present is too old. Only a few people will miss out, most sites using JQuery are pretty up to date..