Hi Nicholas -
Sure, all you need to do is call dispose() on the viz class (this is a requirement when the viz variable is already "pointing" at a viz it just rendered), set the url variable to a new viz, and then re-instantiate the via with viz = new tableauSoftware....
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I have this so far:
Any Help would be much appreciated!
There are several training vids on the subject of the JS API - I think watching 'em would probably be a good thing for you.
Here's one that covers the displose() method: