Possible Duplicate:

Landscape printing from HTML

I am using below code to show print window on button click:

function print_onclick() {

    window.print();

    return false;

}

I want the page to be printed in Landscape format. Is there any property I can add in above code to make it work ?

Additional Info:
Since my page width is 1280 px, when I print it on A4 paper with portrait orientation, the font becomes too small.
I want to print only 2 lines. If not landscape, is there a way I can fix the font size of those table cell/divs while printing ?