อยากวิธีใช้ keyword 2 ชนิดในการค้นหาข้อมูลในหน้าเว็บ โดยแบ่งเงื่อนไขโดยใช้ติ้กที่ radio เพื่อเลือก keyword

<?
	$strSQL = "SELECT * FROM table WHERE 1 ";

	if($_POST["txt1"] != "")
	{
		$strSQL .= " AND F1 = '".$_POST["txt1"]."' ";
	}

	if($_POST["txt2"] != "")
	{
		$strSQL .= " AND F2 = '".$_POST["txt2"]."' ";
	}
?>

if(isset($_REQUEST["IQRID"]) || isset($_REQUEST["RT_NO"]) )
		{
			$strIQRID = $_REQUEST["IQRID"]; 
			$strRT_NO = $_REQUEST["RT_NO"];
			
			$strSql = "";
			$strSql .= "SELECT ID, IQRID, RT_NO, FBN_PN, PN_DESCRIPTION, CUSTOMER, MFG_PN, MFG_NAME, SUPPLIER_CODE, DATECODE, LOTCODE, REVISION, EXPDATE, MSDLEVEL, EN, 
                         DATETIME, QTY, RECORD_MODE, ORACLE_TIMESTAMP, FITS_TIMESTAMP FROM dbo.XXIQA_TO_FITS ";
			$strSql .= " Where  1=1 ";
			
			if($_REQUEST["IQRID"] != "")
					$strSql .= " AND IQRID like '".str_replace("*","%",$strIQRID)."' ";
			if($_REQUEST["RT_NO"] != "")
					$strSql .= " AND RT_NO like '".str_replace("*","%",$strRT_NO)."' ";
			
			//echo $strSql ;
			
			$result = mssql_query($strSql, $link) or die('MSSQL error: ' . mssql_get_last_message());
			$total = mssql_num_rows($result);
		
			if($total > 0)
			{
				$row = mssql_fetch_array($result);
				//echo "<pre>".print_r($row,true)."</pre>";
			}
			
			//echo $total;
			//echo "<pre>".print_r($result,true)."</pre>";
		}