Deactivate submit button with JavaScript/CSS

We've a submit button, styled by CSS:

                  <td><input name="submit" type="submit" value="Submit" class="form-button" /></td>      

How to deactivate/shade the button just after pressing submit (to avoid double click and visualize the deactivation).
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<script language="javascript">
function disableField() {
<td><input onclick="javascript:disableField();"> name="submit" type="submit" value="Submit" class="form-button" /></td>

Why do you want to disable it?

go4javaAuthor Commented:
...actually I need to disable the SUBMIT button first and afterwards it should evaluate form's action. Reason as above.
Just put: document.formXXX.elementXXX.disabled=true; in the first line of the form validation, then. (Just remember to set disabled to false, if validation fails and they need to resubmit.) Is this what you are after?

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go4javaAuthor Commented:
I made it like that:

<script type="text/javascript">
// client side validation
function chkFormular() {
      // disable submit button
      // error counter
      var i = 0;
      // ... place here validation code
      // ...
      // ...
      if (i>0) {            
            // enable submit button
            return false;
      } else {                        
            return true;

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