function printit()
{
    if (window.print) self.print();
    if(document.all && navigator.appVersion.substring(22,23)==4) {   // für IE4 
        self.focus();
        var OLECMDID_PRINT = 6;
        var OLECMDEXECOPT_DONTPROMPTUSER = 2;
        var OLECMDEXECOPT_PROMPTUSER = 1;
        var WebBrowser = '<OBJECT ID="WebBrowser1" WIDTH="0" HEIGHT="0" CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>';
        document.body.insertAdjacentHTML('beforeEnd',WebBrowser);
        WebBrowser1.ExecWB(OLECMDID_PRINT,OLECMDEXECOPT_DONTPROMPTUSER);
        WebBrowser1.outerHTML = '';        
    }
}

<!--
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
//-->