var scrollView = Titanium.UI.createScrollView({
    contentWidth:'auto',
    contentHeight:'auto',
    top:0,
    showVerticalScrollIndicator:true,
    showHorizontalScrollIndicator:true,
    zoomScale:1
});

var view = Titanium.UI.createImageView({
	image:'zebra.jpg',
    width:'auto',
    height:'auto'
});
var x=0;

function zoom(){
if(x==1){
view.animate({width:view.width/2, height:view.height/2});
x=0;
}
else{
view.animate({width:view.width*2, height:view.height*2});
x=1;
}
}
view.addEventListener('doubletap',zoom);
scrollView.add(view);
win1.add(scrollView);