Add event listener to Titanium

I'm new to Titanium and Web programming and Mobile apps. I want to make simple event listener. When I click the image another window opens. The other windows must be an external .js file

var image=Ti.UI.createImageWiew({
image:'...............',
 })


image.addeventListener('click',function(){

//what do I write here?

 )

Write this code inside your listener:

image.addeventListener('click',function(){
    var window = Ti.UI.createWindow({
         url:'external.js' 
    });   
    Ti.UI.currentTab.open(window,{animated:true});

});

And write this code inside your external.js file:

var window = Ti.UI.currentWindow;
window.backgroundImage = 'your-bg-image';

If you are opening a window using url, you can't do this:

var win=Ti.UI.createWindow({ });

inside your js file.