Submit form using <a> tag

I am trying to submit a form through onclick event on tag. I have tried triggering document.myform.submit(), this.form.submit(), parentNode.submit() etc. but none of this is working! Using a submit button, the code works fine. But I want to use tag in place of that. Need some help.

            <form id="myform" name="myform" method="POST" action="process_edit_questionnaire.php?project=<?php echo $project_id; ?>">
                <input name="module" type="hidden" value="<?php echo $module_id;?>"/>
                <input name="project" type="hidden" value="<?php echo $project_id;?>"/>
                <input name="hidden_ques_id" type="hidden" value="<?php echo $data_array_ques[$j]['ques_id'];?>"/>

            <div id="question_block">

                <div id="serial_block">
                    <p id="s_original_<?php echo $j+1; ?>"><a href="#" onclick="showSelectBox(<?php echo $j+1; ?>)">Serial : 
                        <?php 
                        if($data_array_ques[$j]['ques_position']==NULL){ 
                            echo $j+1;                            
                        } 
                        else { 
                            echo $data_array_ques[$j]['ques_position'];         
                        } ?></a></p>
                    <p id="s_select_box_<?php echo $j+1; ?>" style="display: none;">Serial : 
                        <select name="serial">
                          <?php for($p=1;$p<=count($data_array_ques);$p++){ ?>
                                    <option value="<?php echo $p; ?>" <?php if($p==$data_array_ques[$j]['ques_position']){ echo "selected=\"selected\"";} ?> ><?php echo $p; ?></option>
                          <?php }  ?>
                        </select>
                    </p>
                </div>