var xmlHttp3;
function lacat()
{
    var valor1 = document.getElementById("buscat").value;	
    var url1="listado.asp?id="+valor1
    xmlHttp3=GetXmlHttpObject(stateChanged3)
    xmlHttp3.open("GET", url1 , true)
    xmlHttp3.send(null);
}
 
 
function stateChanged3()
{
    if (xmlHttp3.readyState==4 || xmlHttp3.readyState=="complete")
    {

             document.getElementById("bcat").innerHTML = xmlHttp3.responseText;


    }
}

 
function GetXmlHttpObject(handler)
{
    var objXmlHttp=null
 
    if (navigator.userAgent.indexOf("Opera")>=0)
    {
        alert("Opera not supported...")
        return;
    }
    if (navigator.userAgent.indexOf("MSIE")>=0)
    {
        var strName="Msxml2.XMLHTTP"
        if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
        {
            strName="Microsoft.XMLHTTP"
        }
        try
        {
            objXmlHttp=new ActiveXObject(strName)
            objXmlHttp.onreadystatechange=handler
            return objXmlHttp
        }
        catch(e)
        {
            alert("Error. Scripting for ActiveX might be disabled")
            return
        }
    }
    if (navigator.userAgent.indexOf("Mozilla")>=0)
    {
        objXmlHttp=new XMLHttpRequest()
        objXmlHttp.onload=handler
        objXmlHttp.onerror=handler
        return objXmlHttp
    }
}