<form method="get" action="http://www.google.com/search">
<div style="border:2px dotted black;padding:4px;width:15em;">
<table border="0" align="center" cellpadding="0">
<tr><td>
<input type="text"   name="q" size="25" style="color:#808080;"
maxlength="255" value="Google site search"
onfocus="if(this.value==this.defaultValue)this.value=''; this.style.color='black';" onblur="if(this.value=='')this.value=this.defaultValue; "/>
<input type="submit" value="Go!" />
<input type="hidden" name="sitesearch" value="yoursite.com" /></td></tr>
</table>
</div>
</form>