jQuery error only in IE (8) - "Object doesn't support..."

I have this snippet of code (AJAX) in jQuery.

$.get('someScript.php?lat=' + clickedLatLng.lat() + '&lon=' + clickedLatLng.lng() + '&value=5', doSomething);

And this is a function (shows an icon on Google Maps and changes some values in input fields).

function doSomething(data) {
    data = data.trim();
    data = data.split(","); 
    var stopName = data[0];
    var stopLat = data[1];
    var stopLon = data[2];

    $("#start").val(stopName);

    if (startMarker == null) {
        startMarker = new google.maps.Marker({
                            position: new google.maps.LatLng(stopLat,stopLon),
                            map: map,
                            zIndex: 2,
                            title: stopName,
                            icon: startImage 
        });
    } else {
        startMarker.setPosition(new google.maps.LatLng(stopLat,stopLon));
    }
}

But it works in all browsers except IE, in my case IE 8. I didn't test it in IE 6/7. It pops out this error...

I looked into jquery.js and this is the function where it breaks...

            // resolve with given context and args
            resolveWith: function( context, args ) {
                if ( !cancelled && !fired && !firing ) {
                    firing = 1;
                    try {
                        while( callbacks[ 0 ] ) {
                            callbacks.shift().apply( context, args );
                        }
                    }
                    finally {
                        fired = [ context, args ];
                        firing = 0;
                    }
                }
                return this;
            },

actually

callbacks.shift().apply( context, args );

Can someone help? Where is the problem? The same thing with jquery-1.4.4.js

EDIT: This is my larger code...

    // Set some events 开发者_如何学Pythonon the context menu links
contextMenu.find('a').click( function()
{
    // fade out the menu
    contextMenu.fadeOut(75);

    // The link's href minus the #
    var action = $(this).attr('href').substr(1);

    switch (action) {
        case 'startMenu':
            $.get('someScript.php?lat=' + clickedLatLng.lat() + '&lon=' + clickedLatLng.lng() + '&radijus=5', doSomethingWithData1);
            break;

        case 'stopMenu':
            $.get('someScript.php?lat=' + clickedLatLng.lat() + '&lon=' + clickedLatLng.lng() + '&radijus=5', doSomethingWithData2);    
            break;
    }

    return false;
});

When user clicks on an item within context menu on Google Maps then do "doSomethingWithData1" and "doSomethingWithData2". This is also some code for context menu

    // Hover events for effect
contextMenu.find('a').hover( function() {
    $(this).parent().addClass('hover');
}, function() {
    $(this).parent().removeClass('hover');
});

and this for AJAX

$.ajaxSetup ({  
        cache: false  
    }); 

This is how I included my jQuery scripts.

    <!-- Google Maps -->       
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>

<!-- Load Javascript / jQuery -->
<script type="text/javascript" src="js/jquery-1.5.js"></script>
<script type="text/javascript" src="js/jquery.ui.core.js"></script>
<script type="text/javascript" src="js/jquery.ui.position.js"></script>
<script type="text/javascript" src="js/jquery.ui.widget.js"></script>
<script type="text/javascript" src="js/jquery.ui.autocomplete.js"></script>

<link rel="stylesheet" href="js/jquery.ptTimeSelect.css" type="text/css" media="all" />

<script type="text/javascript" src="js/jqtransformplugin/jquery.jqtransform.js"></script>
<link rel="stylesheet" href="js/jqtransformplugin/jqtransform.css" type="text/css" media="all" />

<script type="text/javascript" src="js/jquery.ui.datepicker.js"></script>

---

This was it =/ - .trim() in JavaScript not working in IE

Solution - add this before you use .trim function.

if(typeof String.prototype.trim !== 'function') {
  String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g, ''); 
  }
}

---

The problem is that the variable callbacks is not an array somehow in this case. hence callbacks.shift() fails

As for the reason, Call me paranoid but try your code this way

var url = 'someScript.php?lat=' + clickedLatLng.lat() + '&lon=' + clickedLatLng.lng() + '&value=5';
$.get(url,function(data){
console.log(data);
});

//if the above worked then try this
$.get(url, doSomething);