i am learning javascript. please help me finding problem in this code. <html> <head> <title>Test Javascript</title> <script type="text/javascript"> function validateForm() { var name = document.testform.name; var hobby = document.testform.hobby; var age = document.testform.age; var comment = document.testform.comment; if (name.value == "") { window.alert("Enter your name."); name.focus(); return false; } if (hobby.value == "") { window.alert("Enter your hobby."); hobby.focus(); return false; } if (age.value == "") { window.alert("Enter your age."); age.focus(); return false; } if (comment.value == "") { window.alert("Enter your comment."); comment.focus(); return false; } return true; } </script> </head> <body> <form name="testform" action="tt.php" method="POST" onsubmit="return validateForm();" > Name: <input type="text" name="name" /> <br /> <br /> Hobby: <input type="text" name="hobby" /> <br /> <br /> Age: <input type="text" name="age" /> <br /> <br /> Comment: <input type="text" name="comment" /> <input type="button" value="Place Order" /> </form> </body> </html> HTML: