Form Validations

my form contains some labels and Textboxes.
user enter data into text,  if data is invalid data then raise the  error messge  not raise the alert message, is beside of the textbox. the process is check all fileds in my form. i am click the submit button



Example1:

        Enter E-mail    

Raju

                                              invalid user-mail

  Enter Data  
                                              please eneter the data


                    Submit   


Example2:


    Enter E-mail    

[email protected]

                                            

  Enter Data  
                                              please eneter the data

 
                    Submit   



please help