I do not know if you are talking about a footer within your actual graphic or the url the print process within the browser is doing.
If its the url the print process is doing its really up to the browser if he has a feature to turn that off.
If its the footer information i would recommend using a print stylesheet and within that stylesheet to do
display: none;
For the particular ID or class of the footer.
To do a print stylesheet, you need to add this to the head.
<link rel="stylesheet" type="text/css" href="/css/print.css" media="print" />