Can someone please make me a bookmarklet (simple) PLEASE :-)?

[mpt-matthew]

Ok, I can't write java, and i would like a bookmarklet to do a simple task.

I want it to amend the URL of the current page and refresh it.
Basically, it's to add my University E-Proxy to a URL, so i can quickly access a journal.

E.g.

Original URL is: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11729.html
Changes to: http://www.nature.com.ezproxy4.lib.le.ac.uk/nature/journal/vaop/ncurrent/full/nature11729.html

Notice, ".ezproxy4.lib.le.ac.uk" is added after the root website.
It should then forward to a login page.
I would like a bookmarklet to add this automatically for me please.

This would be really helpful thanks!