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Use this to call your function:

<a href="javascript:toggleDiv('service_twitter','service_facebook','service_netvi bes','service_rss')">Show/Hide all</a>

Now in the function below, all of the...

Your code works just fine. Its just your markup on the html page is not right. Take out the very first line

<xml version = "1.0" encoding = "utf-8"?>

Also your missing the closing </html>...