Analysing Javascript from other page to emulate POST request
<p>There  is a page with a form. When I press the "send" button, two values <code>next.x</code> and <code>next.y</code> are added to the POST request.</p>

<p>How do I find out where these values are coming from? Without those values the POST request is not accepted by the page.</p>

<p>I searched all files but I could not find any <code>next.x</code> anywhere. I tried different javascript debuggers and there is a function triggered when the submit button is pressed. But I could not find those values there either.</p>

<p>Also after the script is executed the values still not in the form. I checked input fields and target url.</p>
