What is wrong with the code below, I added the eventlistener at the bottom but it generates an error, cannot find variable, imageview.

What am I doing wrong?

var win = Titanium.UI.currentWindow;

var f = Ti.Filesystem.getFile(Titanium.Filesystem.resourcesDirectory,'images/sb1.png');

var imageView = Titanium.UI.createImageView({
    image:f,
    width:300,
    height:200,
    top:0
});

win.add(imageView);

imageview.addEventListener('swipe', function(e)
{
Titanium.UI.createAlertDialog({title:'Dialog Box',message:'This message will pop-up'}).show();
});