What is the reason for JavaScript not getting the element by id?

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S code

JavaScript Code?

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functionshow_more_mess(){    $("#background_div").css("width","100%");//获取这个div的时候是没有问题的    $("#background_div").css("height","100%");    $("#background_div").css("position","absolute");    $("#background_div").css("left","0");    $("#background_div").css("top","0");    $("#background_div").css("display","block");    alert(document.getElementById("more_mess").innerHTML);//这边是作测试用的，报错显示获取不到这个元素}functionshow_div(){    $("#more_mess").css("display","block");//这边没有象没有执行一样     }

asp. Net foreground code

C # code?

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<div id="background_div"runat="server"style="position:absolute; display:none; background:#999999; filter:Alpha(opacity=50)">        </div>        <div id="more_mess"runat="server"style="position:absolute;width:100px; height:100px; background:red; display:none; z-index:10">            <div>账户:<asp:TextBox ID="TextBox_show_username"runat="server"></asp:TextBox></div>            <div>密码:<asp:TextBox ID="TextBox_show_pwd"runat="server"></asp:TextBox></div>                    </div>

Asp. Net Backend Code

C # code?

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background_div.InnerHtml = "<script>show_more_mess();";        try        {            TextBox_show_pwd.Text = "a";            TextBox_show_username.Text = "b";            background_div.InnerHtml = "<script>show_div();</script>";            //后台是可以获取到more_mess这个div的        }        catch(Exception ee)        {        }

I think it's Weird. I hope the master can help me see where the problem is.

What is the reason for JavaScript not getting the element by id?