Switching Stylesheets with Javascript

Javascript stylesheet switchers:

Change stylesheet using the document.styleSheets object: Red Blue

Change stylesheet using the document.getElementsByTagName("link") method: Red Blue

Linked stylesheet test The colour of this `<div>` is determined by the linked stylesheets. It should change colour when you change the stylesheet (and should work for both the above methods).	Embedded stylesheet test The colour of this `<div>` is determined by the embedded stylesheets. It should change colour when you change the stylesheet (but only the `document.styleSheets` method will in fact work).
Linked persistent stylesheet test The colour of this `<div>` is determined by a linked persistent stylesheet -- it should always be yellow.	Embedded persistent stylesheet test The colour of this `<div>` is determined by an embedded persistent stylesheet -- it should always be lime.