function verifcp()
{
    if(document.getElementById("caut").value!="")
    {
    cp();
    }
}

  
    function cp()
{
var XmlHttp;
try
  {
  XmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  try
    {
    XmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      XmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX. Please use Internet Explorer !");
      return false;
      }
      }
      }
    XmlHttp.onreadystatechange=function()
    {
    if(XmlHttp.readyState==4)
      {

      document.getElementById("Pagina").innerHTML=XmlHttp.responseText;
      }
    }
  XmlHttp.open("POST","SFCauta.php",true);
  XmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
  XmlHttp.send("xtxt="+document.getElementById("caut").value);
  }