jQuery alert / scrollTop not working in Opera or IE7

Wondering why I get this alert to work in Firefox and Safari but not Opera or IE... an开发者_JAVA百科y insight much appreciated!

    $().scroll(function() {
    var scrolledpx = parseInt($().scrollTop());  

    if (scrolledpx < 375) {
        alert('true');
    }
});

 $(window).scroll(function() {
    var scrolledpx = parseInt($(window).scrollTop());  

    if (scrolledpx < 375) {
        alert('true');
    }
});