var xmlHttp;
var theID;

function showGraph(gid, pid, wid, objid)
{ 
    xmlHttp = GetXmlHttpObject();
    
    if (xmlHttp == null) {
        alert ("Browser does not support HTTP Request");
        return;
    }
    
    var url = "chartapi/generatechart.php";
    url = url + "?statid=" + gid;
    url = url + "&stid=" + pid;
    url = url + "&wid=" + wid;
    
    theID = objid;
    
    xmlHttp.onreadystatechange = stateChanged;
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);
}

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

function GetXmlHttpObject()
{
    xmlHttp = null;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp = new XMLHttpRequest();
    }
    catch (e1) {
        //Internet Explorer
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e2) {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    
    return xmlHttp;
}