jQuery position

I'm using the following code with the script attached as a file to a page.
For whatever reasons it keeps showing the coordinates of the Save button as 0, 0 even though the button is in a middle of the page.
It finds the button, so it alerts 'Save' and everything.

Any ideas why it's happening?

Code:

---

var saveButtonValue = "Save";

$(document).ready(function () {
    alert('j');
    findButtonSides();
});

function findButtonSides() {
    saveButton = findButtonByValue(saveButtonValue);
    var sb = $(saveButton);
    var position = sb.position();

    alert(position.left + ', ' + position.top);
}

function findButtonByValue(buttonValue) {
    var aButton = document.getElementsByTagName("input");
    var returnElement
    for (i = 0; i < aButton.length; i++) {
        var b = aButton[i];
        if (b.value == buttonValue) {
            alert(b.value);
            return b;
        }
    }
}

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