$(document).ready(function() {
    var prLoad = new Image(5, 3);
    prLoad.src = "images/h_carrow.gif";
    
    $(".doOrderBlock .content").mouseover(function() {
        $(this).prev(".arrow:first").css("background-image", "url(images/h_carrow.gif)");
    })
    .mouseout(function() {
        $(this).prev(".arrow:first").css("background-image", "url(images/carrow.gif)");
    });
});