how to change layout of fieldset button?

 Hi there,
I want to include a <fieldset> in my page, and have a couple of problems.. The fieldset looks like:
 <fieldset>

<legend>Search</legend>

<label>User name</label>

<input type="text" value="15" runat="server">

<input type="button" value ="Search" runat="server" />

</fieldset> 
I want to display the search button  'right' of the input field, instead of 'below' (as it seems to default to). Could someone tell me how please?
Another thing about the button thats annoying me.. how can I tell me input text element to be re-directed to whatever that button does? I have a vb function handling the button, but i can't apply i ...