为什么改变图像的来源，执行我的内联javascript

我刚刚创建了一个网页，使用pagememethods这样的

function get_frame() {
    //send a request to change image named "1.jpeg" in path of "src/frames/1.jpeg"
    PageMethods.GrabFrame(imgw, imgh, t, f);
}
function t() {
    //refresh image source to new image and set timer
    document.getElementById('dImg').src = "src/frames/1.jpeg?" +
    new Date().getTime();
    setTimeout(function () { get_desktop(); }, Main.IMGrefresh.value);
}
function f() {
    //do nothing
    var x = 0;
}

还使用了内联javascript和jquery，像这样

<script>
    $("#cover").mousemove(function (e) {
        var parentOffset = $(this).parent().offset();
        var relX = e.pageX - parentOffset.left;
        var relY = e.pageY - parentOffset.top;
        move_mouse(relX, relY);
    });
</script>

和一些asp.net客户端代码，如

<div id="dDiv">
    <img id="dImg" alt="" src="" />
    <div id="cover">
    </div>
</div>

内联javascript位于html代码的末尾

所以move_mouse()方法必须运行只有当用户移动他的鼠标，它正确移动，但它移动即使鼠标没有移动当图像刷新，我的意思是当图像刷新javascript，它运行move_mouse方法。

#cover {
    position:absolute;
    top:0px;
    left:0px;
    text-align:center;
    background-color:Black;
    height:200px;
    width:300px;
    border:0px none black; 
    margin:0px auto 0px auto;
    filter: alpha(opacity=1);
    -moz-opacity: 0.01;
    -khtml-opacity: 0.01;
    opacity: 0.01;
}
#dDiv {
    position:relative;
    text-align:center;
    background-color:Black;
    height:200px;
    width:300px;
    border:0px none black; 
    margin:0px auto 0px auto;
}
#dImg {
    background-color:Black;
    height:200px;
    width:300px;
    border:0px none black; 
    margin:0px 0px 0px 0px;
}

javascript

function resize() {
    imgh = Main.IMGheight.value;
    imgw = Main.IMGwidth.value;
    $("#dDiv").css("height", imgh);
    $("#dDiv").css("width", imgw);
    $("#dImg").css("height", imgh);
    $("#dImg").css("width", imgw);
    $("#cover").css("height", imgh);
    $("#cover").css("width", imgw);
}