/* ----------abrir ventana-------------------*/
function abreventanaEquipos(){
  window.open("","nuevaventana",'width=740,height=500,scrollbars=yes');
  return false;
}



//detecta navegador
function checkIt(string){
 var detect = navigator.userAgent.toLowerCase();
 place = detect.indexOf(string) + 1;
 thestring = string;
 return place;
}
//adaptar la altura del iframe a su contenido
function resize() {
 if (checkIt('opera')){
 alert("opera")
  document.getElementById("ifrm").height =
document.getElementById("ifrm").document.body.scrollHeight;
 }
 document.getElementById("ifrm").height =
document.getElementById("ifrm").contentWindow.document.body.scrollHeight;
}


/***************************************************/

  <script language="Javascript">

function imprimir() {
if (window.print)
window.print()
else
alert("Para imprimir presione Crtl+P.");
}

</script>