ผมต้องการสร้างการค้นหาด้วยภาษาphpวันที่เริ่ม ถึงวันที่ ชื่อ รหัส ใครรู้ตอบทีครับ

<form name="frmSearch" method="POST" action="<?=$_SERVER['SCRIPT_NAME'];?>">
<select name="site_doc" id="site_doc" value="<?=$_POST["site_doc"];?>">
			<option value="">Brance</option>
			<?
			include "connect.php";
			$strSQL = "SELECT * FROM site ORDER BY id_site ASC";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["name_site"];?>"><?=$objResuut["name_site"];?></option>
			<?
			}
			?>
		  </select>
                    <select name="code_dept" id="code_dept" value="<?=$_POST["code_dept"];?>">
			<option value="">Department</option>
			<?
			include "connect.php";
			$strSQL = "SELECT * FROM department ORDER BY id_dept DESC";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["code_dept"];?>"><?=$objResuut["name_dept"];?></option>
			<?
			}
			?>
		  </select>
		  <select name="doctype_code" id="doctype_code" value="<?=$_POST["doctype_code"];?>">
			<option value="">Standard</option>
			<?
			include "connect.php";
			$strSQL = "SELECT * FROM doc_type ORDER BY id_dtype DESC";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["name_dtype"];?>"><?=$objResuut["name_dtype"];?></option>
			<?
			}
			?>
		  </select>
		            <select name="type2" id="type2" value="<?=$_POST["type2"];?>">
			<option value="">Type</option>
			<?
			include "connect.php";
			$strSQL = "SELECT * FROM type2 ORDER BY id_type2 DESC";
			$objQuery = mysql_query($strSQL);
			while($objResuut = mysql_fetch_array($objQuery))
			{
			?>
			<option value="<?=$objResuut["name_type2"];?>"><?=$objResuut["name_type2"];?></option>
			<?
			}
			?>
		  </select>
		  <input name="txtKeyword" type="text" id="txtKeyword" value="<?=$_POST["txtKeyword"];?>">
		  <input type="submit" value="Search">
		  </form>
</div>
<div class="fadehover9">
<a href="center.php">CENTER</a>
</div>
</div>
</div>
<?   

include "connect.php";

  // Search By Name or Email
    $strSQL = "SELECT * FROM document where 1";
    
    	if($_POST["site_doc"] != "")
	{
		$strSQL .= " AND site_doc = '".$_POST["site_doc"]."' ";
	}
		if($_POST["code_dept"] != "")
	{
		$strSQL .= " AND dept_code = '".$_POST["code_dept"]."' ";
	}
		if($_POST["doctype_code"] != "")
	{
		$strSQL .= " AND doctype_code = '".$_POST["doctype_code"]."' ";
	}
		if($_POST["type2"] != "")
	{
		$strSQL .= " AND type_doc  = '".$_POST["type2"]."' ";
	}
		if($_POST["txtKeyword"] != "")
	{
		$strSQL .= " AND description  LIKE '%".$txtKeyword."%' ";
	}