Vertically Align DIV at the middle of another DIV

HI

I have 2 div like below

  <div id="logo">
                 <div id="logo1">

<asp:Label ID="Lblname" runat="server" CssClass="lbllogo" >
                        
                 </div>

</div>

with below css

#logo
{
     float:right;
      border:1px solid green;
       width:650px;
        height:130px;
    
    }


#logo1
{
 
     margin:1px 0px 0px 0;
    float:right;
     border:1px solid red;
 

  
    } 

I want Div id="logo1" in vertical align be at the center of  <div id="logo">

I put  vertical-align:middle;   for  div id="logo1" but it didn't work

What can I do?

thanks alot