Why is the full page read and not only the main text content of the page?

Make sure that you have defined the reading area correctly. The ID attribute of the element containing the content that is to be read have to be the same as the value of the &readid-parameter in the call to ReadSpeaker.

Example:
If this div will be used as the reading area

<div id="maincontent">

This is how the readid-parameter needs to look like

&readid=maincontent