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For loop with alert dialog

<html> <head> <script language="JavaScript"> <!-- function seeElem(f)  {   var elementList = "";   for (var num=0; num < f.elements.length; num++) {       elementList += num + ". " + f.elements[num] + "\n";   }   alert(elementList); } //--> </script> </head> <body> <form> <table> <tr>  <td>Name:</td>  <td><input name="persname"              type="text"> </tr> <tr>   <td>E-mail:</td>   <td><input name="email" type="text"></td> </tr> </table> <input type="button" value="See elements" onClick="seeElem(this.form)"> </form> </body> </html>