jquery if statement based on screen size

Just test for screen.width > 1024.

https://developer.mozilla.org/en/DOM/window.screen.width

$(document).ready(function() {
    // This will fire when document is ready:
    $(window).resize(function() {
        // This will fire each time the window is resized:
        if($(window).width() >= 1024) {
            // if larger or equal
            $('.element').show();
        } else {
            // if smaller
            $('.element').hide();
        }
    }).resize(); // This will simulate a resize to trigger the initial run.
});

Edit:

Or maybe this is what you're after:

$(document).ready(function() {
    if($(window).width() >= 1024) {
        $('a.expand').click();
    }
});

This will toggle the element when document is ready if the width is correct.