How can javascript work perfectly in FireFox, but not work at all in other browsers?

I use FireFox as my main browser, especially when testing out my site, Avoru. However, when checking to see if my code was working properly across other major browsers (Google Chrome, Opera, and Safari), I found that none of my custom javascript seemed to work. Although the functions and code were clear in the page source, using typeof returned an 'undefined' value for all my functions.

What is the root of this problem? If it makes any difference, I use both the Prototype and jQuery libraries for my code, as well as load all javascript at the bottom of the page (for speed reasons). Thanks!

EDIT: Here is some of the code.

// === var $j frees up the $ selector. === //
var $j = jQuery.noConflict();
// === Function: loading(); and loaded(); Manually controls the #loading element. === //
function loading(){
    $j('#load_ovrly').css({'display':'block'});
    $j('#loader').fadeTo('fast',1);
}
function loaded(){
    $j('#load_ovrly').css({'display':'none'});
    $j('#loader').fadeTo('fast',.0001);
}
// === Function: content(); Using everything after the #, the hash is processed and requested. === //
function content(theHash){
    var hashIndex = theHash.indexOf('-');
    var commaIndex = theHash.indexOf(',');
    // === 开发者_如何学GoSplit the Hash accordingly. === //
    if((hashIndex > commaIndex) || (commaIndex == -1 && hashIndex == -1)) newHash = theHash.split(',');
    if((commaIndex > hashIndex) || (commaIndex == -1 && hashIndex != -1)) newHash = theHash.split('-');
    // === Set some extra variables for proofing. === //
    var url = newHash[0]+".php";
    // === Get parameters if there are any. === //
    if(newHash[1]){
        var Json = jsonify(newHash[1]);
        var pars = "p="+Json;
    }else{
        var pars = "p={\"forcepars\":\"true\"}";
    }   
    // === Finally request the page. === //
    request(url,pars);
}
// === Function: jsonify(); Turns the leftover hash from content(); into valid JSON. === //
function jsonify(str){
    var Json = "{";
    var split = str.split(",");
    for(var a = 0; a < split.length; a++){
        if(a > 0){Json = Json+",";}
        var b = split[a].split(":");
        if(b[1] != undefined) Json = Json+"\""+b[0]+"\":\""+b[1]+"\"";
    }
    return Json+"}";
}
// === Function: AJAX(); Sends an ajax request given the url, some parameters, and the onComplete. === //
function AJAX(url,parameters,complete){
    $j.ajax({
        type: 'POST',
        url: url,
        data: parameters,
        complete: function($data){
            var data = $data.responseText;
            complete(data);
        }
    });
}
// === Function: request(); Takes the properly formatted url and parameters and requests the page. === //
function request(url,parameters){
    AJAX(url,parameters,
        function(data){
            $j('#my_box').html(data);
        }   
    );      
}
// === Function: sendForm(); Sends the form and updates the page. === //
function sendForm(id,url){
    var form = $j("form#"+id).serialize();
    AJAX(url,form,function(data){$j("#my_box").html(data);});   
}
// === Below are items that are activated once the DOM is loaded. === //
var curHashVal = window.location.hash;
document.observe("dom:loaded",function(){   
    $j("#loader").ajaxStart(function(){
        loading();
    }).ajaxStop(function(){
        loaded();
    }); 
    if(window.location.hash.length > 1) content(curHashVal.substr(1));
    new PeriodicalExecuter(function() {
        if(curHashVal != window.location.hash){
            content(window.location.hash.substr(1));
            curHashVal = window.location.hash;
        }
    },.15);
}); 

If typeof returned undefined for your functions, chances are there was some parse-time error of the javascript. This means that something that firefox was lenient about accepting in your code, other browsers weren't.

What I'd do is pass the code through JSLint to see if there are any errors. I saw several errors in your code, but I'm not sure if it would be the cause of the problem. Once the JSLint errors are fixed, your code will either work directly, or the cause of the error will be obvious.

Possibly when you drill into the jQuery libraries, you'll find that there are browser specific implementations for its classes and methods. I noticed this with its AjaxManager.

Perhaps you've made the mistake I talked about here: http://my.opera.com/hallvors/blog/show.dml/26650 somewhere in your code?

Anyway, to really answer this question we'd need a link to a full page where the problem occurs.