Why do all buttons only control the same row of data?

Why do all buttons only control the same row of data ??? Why do all buttons only control the same row of data? How can this problem be solved. & Lt ;! DOCTYPE & nbsp; html & nbsp; PUBLIC & nbsp; "-// W3C // DTD & nbsp; HTML & nbsp; 4.01 & nbsp; Transitional // EN" & nbsp; "Why do all buttons only control the same row of data ???
Why do all buttons only control the same row of data? How can this problem be solved.

 
  

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         function showtd(num) {            
   
             document.getElementById("bg"+num).style.display = "none";
   
             document.getElementById("show"+num).style.display = "block";
   
             document.getElementById("ba"+num);
   
             document.getElementById("gn"+num);
   
         }
   
         function hidetd(num) {
   
             document.getElementById("bg"+num).style.display = 'block';
   
             document.getElementById("show"+num).style.display = 'none';
   
         }
   
function showtext(){
   
document.getElementById("a").removeAttribute("readOnly");
   
document.getElementById("b").removeAttribute("readOnly");
   
document.getElementById("c").removeAttribute("readOnly");
   
document.getElementById("d").removeAttribute("readOnly");
   
document.getElementById("e").removeAttribute("readOnly");
   
document.getElementById("f").removeAttribute("readOnly");
   
}
   
function hidetext(){
   
document.getElementById("a").readOnly="true";
   
document.getElementById("b").readOnly="true";
   
document.getElementById("c").readOnly="true";
   
document.getElementById("d").readOnly="true";
   
document.getElementById("e").readOnly="true";
   
document.getElementById("f").readOnly="true";
   
}
   

   
     《script》
   

   

   

   
    

    
     

     $db = mysql_connect('localhost','root','root');
     
mysql_select_db('ec',$db);
     
if (!$db)
     
  {
     
  die('Could not connect: ' . mysql_error());
     
  }
     
$result = mysql_query("select * from goods");
     
echo "
     
GoodsID
     
BarCode
     
GoodsName
     
Category
     
Specifications
     
Manufacturers
     
Numbers
     
Instructions
     
Pictures
     
Update
     
Delete
     
";
     
$n = 0;
     
while($row = mysql_fetch_array($result))
     
  {
     
  echo "";
     
  echo "" . $row['id'] . "";
     
  echo "" . "
     
      " . "";
      
  echo "" . "
      
       " . "";