อยากเขียนส่วน add และ edit ไว้ในเดียวกัน ต้องปรับโค้ดยังไงค่ะ if ($_GET["action"]=="add")&&($_GET["action"]==edit){

if ($_GET["action"]=="add"){ 

if ($_GET["action"]=="add")&&($_GET["action"]==edit){ 

//Add New Record
if ($_GET["action"]=="add"){
?>
<div id="content">
<span class="tl"><span class="tr"></span></span> 
<form action="" method="post" name="addRecord" target="_parent" enctype="multipart/form-data" id="addRecord">
	<div class="addrecord">
        <ul>
           <li><div>Receive Date </div><input name="date_txt" type="text"  maxlength="10" Value=""></li>
           <li><div>Year </div><input name="year_txt" type="text"  maxlength="4" Value=""></span></li>
            <li><div>Class </div> <input name="class_txt" type="text"  maxlength="1" Value=""></li>
            <li><div>Type </div> <input name="type_txt" type="text"  maxlength="2" Value=""></li>
            <li><div>Owner </div> <input name="owner_txt" type="text"  maxlength="100" Value=""></li>
            <li><div>Code </div> <input name="code_txt" type="text"  maxlength="25" Value=""></li>
            <li><div>Code TCC </div> <input name="codetcc_txt" type="text"  maxlength="50" Value=""></li>
            <li><div>Serial Number </div> <input name="sn_txt" type="text"  maxlength="100" Value=""></li>
            <li><div>Description </div> <textarea name="des_txt" cols="40" rows="5" Value=""></textarea></li>
            <li><div>Price </div> <input name="price_txt" type="text"  maxlength="10" Value=""></li>
            <li style="margin-left:115px;"><input name="btnAdd" type="submit" value="Add" /></li>   
     </div>
 </form>
 <?
  if(isset($_POST['date_txt'])){ 
  	$objsql="INSERT INTO tb_asset(receiveDate,year,class,type,owner,code,code_tcc,sn,des,price)";
	$objsql .="VALUES ";
	$objsql .="('".$_POST["date_txt"]."','".$_POST["year_txt"]."','".$_POST["class_txt"]."','".$_POST["type_txt"]."','".$_POST["owner_txt"]."','".$_POST["code_txt"]."','".$_POST["codetcc_txt"]."','".$_POST["sn_txt"]."','".$_POST["des_txt"]."','".$_POST["price_txt"]."' )";
	$objquery=mysql_query($objsql) or die (mysql_error());
	if($objquery){
		echo"Save Done.";
 		header( "location:index.php" );
		exit(0);		
	}else{
		echo"Not recorded ";
	}
  }
 ?>