form submit with javascript

Hi there,
hopefully someone can point me in the right direction here. I have a webpage with a form. I need to submit the form automatically and I am using Javascript.

Now when I actually push the submit button, the form is posted to its destination and does what its supposed to. However when I use the Javascript call it, it just reloads the page with the form repeatly. It appears to be repeatidly submitting it and not processing the data in the form.

I have put some code below.

All suugestions welcome

Thanks

The form

<form id="form1" method="post">    
    <table width="400px">
             <tr id="drpTr2">
            <td class="text_desc">
                <label class="desc_text">Success point/percent :</label>
            </td>
            <td>
                 <!--<input style="width:50px" type="text" name="txtSuccessP" id="txtSuccessP" value="<?php // echo xyz96zyx::xyz100zyx("txtSuccessP") ?>"  /> -->
                 
                 <input style="width:50px" type="text" name="txtSuccessP" id="txtSuccessP" value="90"  />
            </td>
        </tr>
               <tr id="drpTr3">
            <td class="text_desc">
                <label class="desc_text">Test time (in minutes) :</label>
            </td>
            <td>
          <!--       <input style="width:50px"  type="text" name="txtTestTime" id="txtTestTime" value="<?php// echo xyz96zyx::xyz100zyx("txtTestTime") ?>"  /> -->
                 <input style="width:50px"  type="text" name="txtTestTime" id="txtTestTime" value="45"  />
         
            </td>
        </tr>
    </table>

    <br>
    <hr />
    <table width="500">
        <tr>
            <td colspan="2">
                <input id="btnLcl" type="button" onclick="ShowUsers('local')" value="Local users" style="border:0;width:150px;color:red" />&nbsp;<input id="btnImp" type="button" onclick="ShowUsers('imported')" value="Imported users" style="border:0;width:150px" />
            </td>            
        </tr>
        <tr>
            <td valign="top" id="tdLocalUsers">
                 <!--<div id="div_grid"><?php //echo $grid_html ?></div> -->
                 <input  type=checkbox name=chkgrd[] value= <?php echo $_SESSION['user_id'] ?> checked />
            </td>
           
            <td valign="top" id="tdImportedUsers" style="display:none">
                    <!--<div id="div_grid"><?php // echo $imported_grid_html ?></div>-->
            </td>
           
        </tr>
    </table>
   
    <table>
        <tr>
            <td><input onclick="return CheckForm()" style="width:100px" type="submit" id="btnSave" name="btnSave" value="Save" /></td>
            <td><input onclick="javascript:window.location.href='index.php?module=assignments'" style="width:100px" type="button" id="btnCancel" name="btnCancel" value="Cancel" /></td>
        </tr>
    </table>

</form>

// This is the javascript

<?php

      echo   '
           <script type="text/javascript">
                  
                  document.forms["form1"].submit();
      </script>' ;
?>