FireFox Image Printing Issue

FireFox Image Printing Issue

I have the following code which prints any HTML loaded in to popup window.
I am printing multiple invoices at once using the following code. As you
could see in the code, when the window is opened the print window is also
opened. The HTML is the 'content' parameter.
function( content ){
var invoice_window = window.open( '', 'print',
'width=500,height=400,fullscreen=0,location=0,menubar=1,resizable=0,scrollbars=0,status=0,titlebar=0,toolbar=0'
);
invoice_window.document.body.innerHTML = content;
invoice_window.print();
invoice_window.close();
}
The HTML content included some images (not background images) as well.
This is working as expected in IE, but not in FireFox. The problem in FF
is the images are not printing, just the 'alt' attribute value is printing
in the image area.
Things I have tested so far;
I commented out invoice_window.close();Then, I can print the page (the
window opened with the HTML content) using the browser's (FireFox) print
option. Then, the images are printing in FF.
Any help would be much appreciated. I thank you in advance.