when refresh page inside tr tag controls are not fit into correct possition ?

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VB

HTML

Hai
in my website ,i have to block and hide tr tag with inside text box and label,when i refresh page inside control not fit into correct position,that is it comes next line.but in page load it will correctly fix.

my html code is

<tr id="email" style="display: block"  runat="server">
<td style="width: 22%">
<asp:Label ID="Label46" runat="server" Text="Email Account" CssClass="font12"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtEmailAc" runat="server" CssClass="font12" Width="160px"></asp:TextBox>
</td>
</tr>

<tr id="pass" style="display: block;"  runat="server">
<td style="width: 22%">
<asp:Label ID="Label47" runat="server" Text="Email Password" CssClass="font12"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtEmailPass" runat="server" Width="160px" CssClass="font12" onkeyup="MainPass()" onchange="MainPass()" TextMode="Password"></asp:TextBox>
</td>
</tr>

and server side code is

Dim usercred As String = "False"
        If row("Email").ToString = "True" Then
            usercred = "True"

            email.Attributes.Remove("style")
            pass.Attributes.Remove("style")

        Else
            email.Attributes.Add("style", "display:none;")
            pass.Attributes.Add("style", "display:none;")
        End If

pls reply asap

Regards
Aravind