pic1 = new Image(8,4);
pic1.src = "../images/arrowUp.gif";
function dropDown()
{
    $("#banner").animate({height:"492px"}, 500);
    $("#bannerImage").animate({height:"474px"}, 500);
    $("#imgWrap").animate({height:"474px"}, 500);
    $("#bannerText").slideDown(500);
    $("#dropdownLink").html("<span>Свернуть</span>");
    $("#dropdownLink").css("background","url(images/arrowUp.gif) left no-repeat");
}

function drowUp()
{
    $("#banner").animate({height:"291px"}, 500);
    $("#bannerImage").animate({height:"273px"}, 500);
    $("#imgWrap").animate({height:"273px"}, 500);
    $("#bannerText").slideUp(500);
    $("#dropdownLink").html("<span>Развернуть</span>");
    $("#dropdownLink").css("background","url(images/arrows.gif) left no-repeat");
}

$(document).ready(function(){
    $("#dropdownLink").toggle(dropDown, drowUp);    
});