คำสั่ง Between ใช้ยังไงเหรอครับ SELECT * FROM tableOne where datein = '$txt_search'

<form id="form1" name="form1" method="post" action="find.php">    
<td width="93" align ="right" bgcolor="#EFEFEF" class=" unnamed1">
		<input name="txt_search" type="text" id="txt_search"  value=""  size="15" />
					 <script language='javascript'>
								if (!document.layers) {
								document.write("<input type=button onclick='popUpCalendar(this, form1.txt_search, \"yyyy-mm-dd\")' value=' Date ' style='font-size:11px'>")}
					</script></td>
        <td width="14" bgcolor="#EFEFEF" align="center"><span class="style15">ถึง</span></td>
<td width="72" bgcolor="#EFEFEF" align="left">
           <input name="txt_search2" type=text id="txt_search" size="12"> 
					<script language='javascript'>
                                if (!document.layers) {
                                 document.write("<input type=button onclick='popUpCalendar(this, form1.txt_search2, \"yyyy-mm-dd\")' value=' Date ' style='font-size:11px'>")}
                     </script></td>
<td width="325" bgcolor="#EFEFEF" align="left">
		<input name="Search" type="image" src="images/btn_go.gif" value=""  title="ค้นหา" height="18"/></td>
</form>