javascript problem

Hi, I am wanting to make a javascript function that will load a new url
from a form submit. Like enter a url in the box click and it loads. It
has to be client side and i'd prefer if it loaded in the same window not
a new one. If anyone has any clue how/if this can be done i would
appreciate it. I havent been able to find anything, my lack of
javascript knowledge doesn't help much.

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