2 Answers

• Create it yourself, it shouldn't be hard. Use filesystem to get the names of the image files, then randomly select them using rand or some other method.

• Just download this function:

  http://phpjs.org/functions/rand:498

  Call your images 0.png 1.png 2.png etc

  Then use something like this:

  var rondomnumber = rand(0,(20-1)); //change 20 to the amount of images you have
  var tabs3 = Titanium.UI.createButton( //or something else then a button...
  {
  backgroundImage: randomnumber+'.png'
  }