so i have a search form,

<div style= "float:left; padding: 3px 0px 0px 60px;" >
				<div id="searchwrapper">
				<form action="" >
				<input type="text"   class="searchbox" name="s" value="" />
				<input type="image" src="{$baseurl}/css/searchboxglass.png" class="searchbox_submit" value="" />
however the problem is, the background image is larger than the standard text form, so on highlight you can see the outline of the smaller text form, how do i prevent this from appearing?