I've been trying to play with Phonegap and created a small application in HTML/Javascript to send an SMS. I tried this code window.location.href = 'sms:XXXXXXXX06?body=Testing' which opens up a screen to manually send the sms which I want to automate. 
Please note that I create an android app by uploading my project source code to build.phonegap.com, so I can not modify the .apk source. 
Is it possible to do it in Javascript only?