If we want to follow the constitution,the cases against president Zardari should not be open as our Islam teachs us that follow the law of the country.
As far as the immunity of rulers concerned,it is quit different from the teachings of Islam.

As Pakistan was created for the name of Islam.So when constitution was being created,the lagislatrs should follow the teachings of Islam.

Now we can follow the teachings of Islam via remove the fake articles which are not regarding Islam.Means new amendments should bring in the constitution.

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"if someone feels that they had never made a mistake in their life,then it means they had never tried a new thing in their life"
(Einstein)