function imprimir()
{
  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);  //Usar 1 vs 2 para mostrar caja de diálogo
    WebBrowser1.outerHTML = "";
  }
}

var VERSION = parseInt(navigator.appVersion);
if (VERSION > 3)
{document.write('<input type=button value="Imprimir" onClick="imprimir()">');}