How to add header and footer functions into ezpdf class

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Hello everyone
I'm using ezpdf class to generate pdf reports from my system. I need to create a header and footer into every page of the report.
I have changed the code of class.ezpdf.php specifically the ezNewPage() method, adding a function named ezAddHeader() and it works fine.
Here is the code of the new method:

function ezAddHeader()
{
    $image = imagecreatefrompng("image.png");
        $this->addImage($image,560,520,200,75);
    $this->ezText(" \n\n\n\n\n",10);
    $this->ezText('"Header"               ',10,array('justification' => 'right'));
    $this->ezText('Doc No. 1               ',10,array('justification' => 'right'));
    $this->ezText('Page No. '.$this->ezGetCurrentPageNumber().'               ',10,array('justification' => 'right'));
}
 

The problem is in the method ezTable. when I create a table that is bigger than the page it doesn't show the header.
Someone can tell me what should I change in the method so it show the header or maybe another solution?