โค้ด Search หนังสือ แบบมี Dropdown Menu เลือกว่าหาจาก หมวด, ชื่อ, เดือน ต้องเขียนอย่างไรคะ

<div style=" float: right; margin-right: 55px;"> 
    
    <form name="frmSearch" method="post" action="<?=$_SERVER['SCRIPT_NAME'];?>" >
Search for Publications
<select name="ddlCountryCode" id="ddlCountryCode">
<option value="category" selected>Category</option>
<option value="date">Date</option>
<option value="title">Title</option>
</select>

      <input name="txtKeyword" type="text" id="txtKeyword" value="<?=$_POST["txtKeyword"];?>">
      <input type="submit" value="Search"></th>

</form>

<?
if($_POST["txtKeyword"] != "")
	{

	// Search By Name or Email
	$strSQL = "SELECT * FROM insight WHERE (incat LIKE '%".$_POST["txtKeyword"]."%' or intitle LIKE '%".$_POST["txtKeyword"]."%')";
	$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
	$Num_Rows = mysql_num_rows($objQuery);


	$Per_Page = 2;   // Per Page

	$Page = $_GET["Page"];
	if(!$_GET["Page"])
	{
		$Page=1;
	}

	$Prev_Page = $Page-1;
	$Next_Page = $Page+1;

	$Page_Start = (($Per_Page*$Page)-$Per_Page);
	if($Num_Rows<=$Per_Page)
	{
		$Num_Pages =1;
	}
	else if(($Num_Rows % $Per_Page)==0)
	{
		$Num_Pages =($Num_Rows/$Per_Page) ;
	}
	else
	{
		$Num_Pages =($Num_Rows/$Per_Page)+1;
		$Num_Pages = (int)$Num_Pages;
	}


	$strSQL .=" order  by inid ASC LIMIT $Page_Start , $Per_Page";
	$objQuery  = mysql_query($strSQL);

	?>
    <br /><br />
	<?
	while($objResult = mysql_fetch_array($objQuery))
	{
	
		$fdname = $objResult["incat"];
		$fddatebook = $objResult["indate"];
		$fdtitle = $objResult["intitle"];
		$fdlink = $objResult["inlink"];
		$fddescription = $objResult["indetail"];
		$fdfilesname = $objResult["filesname"];
	?>
     <table border="0" width="650px;" cellspacing="1" cellpadding="1" align="top" >

	  <tr>
		<td width="60" rowspan="4"><? echo "<a href=\"$fdlink\" target=\"_blank\"><img src=\"insight/$fdfilesname\" width=\"60px;\" height=\"90px;\" border=\"1\" align=\"top\" ></a></div></td>
			<td width=\"361\"></td></tr>
			<tr><td > </td></tr>
			<tr><td ></td></tr>
			<tr><td><span style=\" font-weight: bold;  \">$fdname </span> <br /><span>$fddatebook</span> <br /><span class=\"insighttext\" style=\" font-weight: bold; font-style: italic;\"><a href=\"$fdlink\" target=\"_blank\">$fdtitle</a></span></td></tr>
			<tr><td></td>
   				   <td><span style=\"margin: 0px; padding: 0px;\">$fddescription</span></td></tr><br /><br />" ; ?>
                   
                   
	<?
	}
	?>
	</table>
	<br>
	Total <?= $Num_Rows;?> Record : <?=$Num_Pages;?> Page :
	<?
	if($Prev_Page)
	{
		echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page&txtKeyword=$_GET[txtKeyword]'><< Back</a> ";
	}

	for($i=1; $i<=$Num_Pages; $i++){
		if($i != $Page)
		{
			echo "[ <a href='$_SERVER[SCRIPT_NAME]?Page=$i&txtKeyword=$_GET[txtKeyword]'>$i</a> ]";
		}
		else
		{
			echo "<b> $i </b>";
		}
	}
	if($Page!=$Num_Pages)
	{
		echo " <a href ='$_SERVER[SCRIPT_NAME]?Page=$Next_Page&txtKeyword=$_GET[txtKeyword]'>Next>></a> ";
	}

	}	
	?>



    </div>