$(document).ready(function(){
    $('.outover_rollover').hover(
        function () {
            curr = $(this).attr("src");
            over = curr.replace(/_out\./, '_over.');
            $(this).attr({ src: over});
        },
        function () {
            $(this).attr({ src: curr});
        }
    )

    $('.outover_rollover').each(function(i) {
        temp = this.src;
        pre = temp.replace(/_out\./, '_over.');
        preload_image_object = new Image();
        preload_image_object.src = pre;
    });
});