【求助】IE6下图片宽高问题


$(".smallimg").bind("click",function(e){
                    $(".smallimg").parent().css({"border-color":"#8b8b8c"});
                    $(e.target).parent().css({"border-color":"yellow"});
                    $("#imgMark").fadeTo("slow","0.01",function(){
                    $("#imgMark").remove();
                    $("#imgBox")[0].innerHTML="";
                    $("#imgBox").append("<img src=\""+$(".smallimg")[0].src+"\" id=\"imgMark\" style=\"margin-top:5px;position:absolute; margin-left:28px\" />");
                    $("#imgMark").attr("src",e.target.src);
                    //alert("ffff");
                    if($("#imgMark").width()>900){
                        $("#imgMark").width(900);
                    }
                    if($("#imgMark").height()>597){
                        $("#imgMark").height(597);
                    }
                    var pos = $("#imgBox").offset();
                    var left = ($("#imgBox").width()-$("#imgMark").width())/2+pos.left;
                    var height = ($("#imgBox").height()-$("#imgMark").height())/2+pos.top;
                    $("#imgMark").css({"left":left,"top":height});
                });imgMark 是页面的img对象
imgBox 是imgMark的容器对象
在IE6下面我切换图片了，imgMark的高宽怎么还是上一张图片的，