Allows printing of another page without reloading or using ajax, should work in all browsers and as the frame is loaded after the W3 validator won't moan.

page.html

<div class="print_retroplan_div" id="print_retroplan_div" style="display:none;"></div>

print_frame.js

function print_retroplan() {
        $('#print_retroplan_div').append('<iframe name="print_frame" src="' + base_url + 'retroplan/print_page?ccode=' + ccode + '"></iframe>');
        window.frames["print_frame"].window.focus();
        window.frames["print_frame"].window.print();
}