Hello. I am trying to post this to new post but somehow I can't find the button and so will try to post it here. I have a checkbox with a dropdown list to choose for a number. What I wanted to do is to set the default to 0 (zero) the selected index when they uncheck my checkbox but my function doesn't work when I tried to call it:

 function CheckDropDown(checkbox_person,number_select) { 

    if (!document.getElementById(checkbox_person).checked) { 
        document.getElementById(number_select).selectedIndex = document.getElementById(number_select).options[1]; 
    } 
    else { 
        document.getElementById(number_select).selectedIndex = document.getElementById(number_select).options[0]; 
    } 

} 

Here how I called it but it doesn't work. Please help.

This is how my form is...

<input name="checkbox_table" class="checkbox" type="checkbox" value=<?php echo $checkbox_table; ?> onclick="$('checkbox_table').checked=false; $('numbertable_select').selectedItem = 0;" 
            />I wish to make reservations for 
                <select name="numbertable_select" id="numbertable_select" onchange="CalculateGrandTotal(this.value);" onclick="$('checkbox_table').checked=true;"> 
                    <?php foreach($numbertable_select as $select =>$prompt) : ?> 
                      <option value = "<?php echo $select; ?>" 
                          <?php echo helper_selected($select == $form['numbertable_select']); ?> 
                         > 
                          <?php safeEcho($prompt); ?> 
                     </option>   

                      <?php endforeach;?> 
                </select>table(s) at $550 per person. 
                 <?php helper_error('checkbox_table');?>

So basically, I wanted to have a function to call when the checkbox is uncheck to set my number_select to 0. Any suggestions how to do it? I hope you can help me with this as soon as possible as I am running out of time. Thanks a lot.

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