var xmlHttp

function crGangas(str)
{
if (str.length==0){document.getElementById("vendedor").innerHTML="";return;}
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null){alert ("Your browser does not support AJAX!");return;} 
var url="vendedor.php";
url=url+"?v="+str;
xmlHttp.onreadystatechange=goGetIt;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function goGetIt() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("vendedor").innerHTML=xmlHttp.responseText;
}
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}