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Here’s what you need to do to enable Firefox immediately print without showing the print preferences dialog box.

1. Type about:config at Firefox’s location bar and hit Enter.
2. Right click at anywhere on the page and select New > Boolean
3. Enter the preference name as print.always_print_silent and click OK.

For IE

function printit(){
if (window.print) {
window.print() ;
} else {
var WebBrowser = ‘<OBJECT ID=”WebBrowser1″ WIDTH=0 HEIGHT=0 CLASSID=”CLSID:8856F961-340A-11D0-A96B-00C04FD705A2″></OBJECT>’;
document.body.insertAdjacentHTML(‘beforeEnd’, WebBrowser);
WebBrowser1.ExecWB(6, 2);//Use a 1 vs. a 2 for a prompting dialog box    WebBrowser1.outerHTML = “”;
}
}