javascript setTimeout()

[naurus]

i'd like to know what set timeout does after its finished. I have a script that starts a timeout right before sending an SJaX request that timesout after 1000 milliseconds and abort()s the SJaX request and sets some things then alerts me that it timed out. After i click ok on the alert, my browser (FF) crashes every time. I'd just like to know what happens after the timeout is finished. Here is my code:

var changeBG;
function fetchById(id){
 
    if (document.getElementById){
 
        var fetch = document.getElementById(id);
 
    }
 
    else if (document.layers){
 
        var fetch = document.layers[id];
 
    }
 
    else if (document.all){
 
        var fetch = document.all[id];
 
    }
 
    return fetch;
 
}
function SJAX(url){
    http_request = false;
    if(window.XMLHttpRequest){
        // Mozilla - Safari - Opera
        http_request = new XMLHttpRequest();
    }
    else if(window.ActiveXObject){
        // Internet Explorer
        try{
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e){
            try{
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e){
                //don't do anything and let !http_request do it's job
            }
        }
    }
    if(!http_request){
        updateData('Error: Cannot create an XMLHttpRequest instance!');
        return false;
    }
    http_request.open('GET',url, false);
    timeout = setTimeout("http_request.abort(); alert('Error: Request timed out!'); timerRunning = false;",1000);
    timerRunning = true;
    http_request.send(null);
    if(timerRunning == true){
        clearTimeout(timeout);
    }
 
    if(http_request.status == 200){
        if(http_request.readyState == 4){
            var recoil = http_request.responseText;
            if(recoil == "0"){
                alert("DCL " + validatingDCL + " is invalid.");
            }
            else{
                return recoil;
            }
        }
    }
}
function runTest(){
    for(i=0;i<document.options.testType.length;i++){
        if(document.options.testType[i].checked==true){
            testType = i;
        }
    }
//    speed = fetchById('speed').checked;
    if(testType == 1){
        timeSpanFull = fetchById('timeSpan').value;
        timeSpan = timeSpanFull.split(".");
        timeSpan[0] = parseInt(timeSpan[0]);
        timeSpan[1] = parseInt(timeSpan[1]);
        if(timeSpan[1] == undefined || isNaN(timeSpan[1])){
            timeSpan[1] = 0;
        }
        if(timeSpan[0] == undefined || isNaN(timeSpan[0])){
            timeSpan[0] = 0;
        }
        good = true;
        updateData('', true);
        x = 0;
        beginTime = new Date();
        trueBeginTime = beginTime;
        updateData("<div style='background: #eee; width: 100%; display: inline-table;'>Begin Time: " + beginTime.getMinutes() + ":" + beginTime.getSeconds() + ":" + beginTime.getMilliseconds() + "</div>",false,false);
        beginTime.setSeconds(beginTime.getSeconds() + timeSpan[0]);
        beginTime.setMilliseconds(beginTime.getMilliseconds() + (timeSpan[1] * 100));
        while(good == true){
            currentTime = new Date();
            hours = currentTime.getHours();
            minutes = currentTime.getMinutes();
            seconds = currentTime.getSeconds();
            milliseconds = currentTime.getMilliseconds();
            if(currentTime > beginTime || x >= 500){
                good = false;
                break;
            }
            x = x + 1;
            updateData(x + ": " + hours + ":" + minutes + ":" + seconds + ":" + milliseconds +" - " + SJAX('ajax.php'));
        }
        elapsedMinutes = minutes - trueBeginTime.getMinutes();
        elapsedSeconds = seconds - trueBeginTime.getSeconds();
        elapsedMilliseconds = milliseconds - trueBeginTime.getMilliseconds();
        updateData("<div style='background: #eee; width: 100%; display: inline-table;'>End Time: " + minutes + ":" + seconds + ":" + milliseconds + "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total Time: " + elapsedMinutes + ":" + elapsedSeconds + ":" + elapsedMilliseconds + "</div>",false,false);
    }
    else if(testType == 2){
        reqs = Math.ceil(parseInt(fetchById('timeSpan').value));
        good = true;
        updateData('', true);
        x = 0;
        beginTime = new Date();
        trueBeginTime = beginTime;
        updateData("<div style='background: #eee; width: 100%; display: inline-table;'>Begin Time: " + beginTime.getMinutes() + ":" + beginTime.getSeconds() + ":" + beginTime.getMilliseconds() + "</div>",false,false);
        while(good == true){
            currentTime = new Date();
            hours = currentTime.getHours();
            minutes = currentTime.getMinutes();
            seconds = currentTime.getSeconds();
            milliseconds = currentTime.getMilliseconds();
            if(x >= reqs){
                good = false;
                break;
            }
            x = x + 1;
            updateData(x + ": " + hours + ":" + minutes + ":" + seconds + ":" + milliseconds +" - " + SJAX('ajax.php'));
        }
        elapsedMinutes = minutes - trueBeginTime.getMinutes();
        elapsedSeconds = seconds - trueBeginTime.getSeconds();
        elapsedMilliseconds = milliseconds - trueBeginTime.getMilliseconds();
        updateData("<div style='background: #eee; width: 100%; display: inline-table;'>End Time: " + minutes + ":" + seconds + ":" + milliseconds + "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total Time: " + elapsedMinutes + ":" + elapsedSeconds + ":" + elapsedMilliseconds + "</div>",false,false);
    }
    else if(testType == 3){
        updateData(SJAX('timeout.php'),true);
 
    }
    else{
        updateData(SJAX('ajax.php'), true);
    }
}
function updateData(data,clear,br){
    if(clear == true){
        //Clear the Bottom section
        fetchById('bottom').innerHTML = "";
    }
    if(br == false){
        //Don't add a line break after the line
        br = "";
    }
    else{
        br = "<br />"
    }
    //Populate the Bottom section with more data
    fetchById('bottom').innerHTML = fetchById('bottom').innerHTML + data + br;
    //Change Bottom sections bgcolor to a light yellow for notification
    fetchById('bottom').style.backgroundColor = "#FFC";
    if(data == ""){
        //Clear the field so it doesn't have a break tag
        fetchById('bottom').innerHTML = "";
    }
    //Clear the timeout so you don't have early background changes
    clearTimeout(changeBG);
    //Set the background to change back after 1 second
    changeBG = setTimeout("fetchById('bottom').style.backgroundColor = '#FFF';", 1000);
}
function switchVal(elem){
    if(fetchById(elem).checked == true){
        fetchById(elem).checked = false;
        fetchById(elem).focus();
    }
    else{
        fetchById(elem).checked = true;
        fetchById(elem).focus();
    }
}

[naurus]

seriously, i need some help here. doesn't anybody have anything to say?

[iam_clint]

 timeout = setTimeout("http_request.abort(); alert('Error: Request timed out!'); timerRunning = false;",1000);

Well its aborting the query, alerting you that the request has timed out then setting a variable to false;

[naurus]

 timeout = setTimeout("http_request.abort(); alert('Error: Request timed out!'); timerRunning = false;",1000);

Well its aborting the query, alerting you that the request has timed out then setting a variable to false;

true, but i need to know what happens afterwards, because whatever does is crashing my browser.