"window.onload" function override

In swfupload-settings.tpl.php a function is assigned to window.onload without taking care of the possibility that there may already be some assignment by another module or theme.
It would cause less destruction by doing the assignment with some code like that:

function addOnLoad(nextOnLoad) {    
    var prevOnLoad = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = nextOnLoad;
    } else {
        window.onload = function() {
            prevOnLoad();
            nextOnLoad();
        }
    }
}

addOnLoad(yourOnLoad);

Also it should be noted in the modules description, that there may be other modules/themes overriding the onload setting, what will prevent the appearance of the select_images.png button, which is an annoying non-error-message issue.