How to go about login and logout in phonegap and JQM

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http://stackoverflow.com – Good day, I am new to phonegap and JQM... I have a problem with phonegap and JQM.i did a login and logout application but the backbutton on android being the secure page back after I logout, instead of exiting the application or do something else ... Secondly, how will I remove backbutton event in phonegap...thirdly, must I control the backbutton in my application? (HowTos)