อยากให้form จำค่าที่กรอก ถ้ากรอกไม่สมบรูณ์ ให้กลับมากรอกใหม่ อ่ะคับ

<script language="javascript"> 
function fncSubmit() 
{ 
	if(document.form1.textfield.value == ""){ 
   	   alert('Please check data.'); 
       document.form1.textfield.focus(); 
       return false;  
	}    
    if(document.form1.textfield2.value == ""){ 
   	   alert('Please check data.'); 
       document.form1.textfield2.focus(); 
       return false;  
	}  
}
</Script>

<form name="form1" method="post" action="page2.php" onSubmit="JavaScript:return fncSubmit();">
<table width="250" border="1" cellspacing="1" cellpadding="1">
  <tr>
    <td width="68">&nbsp;</td>
    <td width="169"><input type="text" name="textfield" id="textfield"></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td><input type="text" name="textfield2" id="textfield2"></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td><input type="submit" name="button" id="button" value="Submit">
    <input type="reset" name="button2" id="button2" value="Reset"></td>
  </tr>
</table>
</form>