var xmlHttp 

function showPart(manufacturer_id,equipment_id,model_number) {

    xmlHttp=GetXmlHttpObject()
    if (xmlHttp==null) 
    {
        alert("Browser does not support HTTP Request");
        return;
    }
    
    var url="selectpart.php";
    url=url+"?manufacturer_id="+manufacturer_id
    url=url+"&equipment_type_id="+equipment_id
    url=url+"&model_number="+model_number;
    url=url+"&sid="+Math.random();
    xmlHttp.onreadystatechange=stateChanged
    xmlHttp.open("GET",url,true)
    xmlHttp.send(null)
}

function setPart(part_id) {
    document.getElementById('part').value=part_id;
}

function stateChanged() {
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
        document.getElementById("partSelect").innerHTML=xmlHttp.responseText
    }
}

function GetXmlHttpObject() {
    var xmlHttp=null;
    try {
        xmlHttp=new XMLHttpRequest();
    } catch (e) {
        try {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}