How to set focus for first textbox in popup

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Javascript

Hi all,

I have one popup in button click event..In this popup i have 2 textboxes....In this I need focus in first textbox...

Below script is for popup display action...

<script language="javascript" type="text/ecmascript">
       window.addEvent('domready', function () {
           debugger;
           var myLogin = new mooSlide2({ slideSpeed: 1500, fadeSpeed: 500, toggler: 'login', content: 'loginPanel',  height: 250, close: false, effects: Fx.Transitions.Bounce.easeOut, from: 'top',  });
            $('close').addEvent('click', function (e) {
               e = new Event(e);
               myLogin.clearit();
               e.stop();
           });
       });</script>

This is the design inside the textbox.....

<label for="logf" style="padding-left: 25px">
               Email: 
           </label>
           <label style="padding-left: 25px">
               <asp:TextBox ID="log" MaxLength="42" TabIndex="1002" runat="server" onfocus="if(value=='log:') value = ''"></asp:TextBox>
           </label>
           <label for="pwdf" style="padding-left: 25px">
               Password:</label>
           <label style="padding-left: 25px">
               <asp:TextBox ID="pwd" MaxLength="8" runat="server" TabIndex="1003" TextMode="Password"></asp:TextBox>
           </label>
           <label style="padding-left: 50px">
               <a tabindex="1004">
                   <img id="imgbutton" alt="" src="Staticimage/logingray.png" title="Login" border='0'
                        önclick="return validate()" style="cursor: pointer;" /></a>
           </label>

I need focus in first textbox that ID="log"...

Can anyone help me....