ajax web頁面複雜處理延時、客戶互動問題

<script type="text/javascript">

function Wait()

{

    var child=document.createElement("div");

    child.id="looder";

    child.style.top =300;   

    child.style.left  = 300;   

    child.style.position="absolute";

    child.innerHTML="<img src='../img/loadingAnimation.gif'/>";  

    document.body.appendChild(child);

    child.focus();

}

</script>

this.Button1.Attributes.Add("onclick", this.Page.ClientScript.GetPostBackEventReference(Button1, "Click") + ";this.disabled=true; this.value='初始化..';Wait();");