PHP Set default value in SELECT box

Hello,
I have a list of world countries in a select drop down box, other variables are added depending on the selection but I only want the United States to be selectable.
Given that the United States 'country_id' = 223, and 'name' = "United States", how would I set the default in the following code snippet:
<select name="address[<?php echo $address_row; ?>][country_id]" onchange="country(this, '<?php echo $address_row; ?>', '<?php echo $address['zone_id']; ?>');">
                   <option value=""><?php echo $text_select; ?></option>                                                         
                    <?php foreach ($countries as $country) { ?>                                                     
                    <?php if ($country['country_id'] == $address['country_id']) { ?>                  
                    
                    <option value="<?php echo $country['country_id']; ?>" selected="selected"><?php echo $country['name']; ?></option>
                    <?php } else { ?>
                    <option value="<?php echo $country['country_id']; ?>"><?php echo $country['name']; ?></option>                    
                    <?php } ?>
                    <?php } ?>
                  </select>

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The 'addaddress()' function looks like this:
function addAddress() {&#9;
&#9;html  = '<div id="tab-address-' + address_row + '" class="vtabs-content" style="display: none;">';
&#9;html += '  <input type="hidden" name="address[' + address_row + '][address_id]" value="" />';
&#9;html += '  <table class="form">'; 
&#9;html += '    <tr>';
    html += '&#9;   <td><span class="required">*</span> <?php echo $entry_firstname; ?></td>';
    html += '&#9;   <td><input type="text" name="address[' + address_row + '][firstname]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><span class="required">*</span> <?php echo $entry_lastname; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][lastname]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><?php echo $entry_company; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][company]" value="" /></td>';
    html += '    </tr>';&#9;
    html += '    <tr class="company-id-display">';
    html += '      <td><?php echo $entry_company_id; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][company_id]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr class="tax-id-display">';
    html += '      <td><?php echo $entry_tax_id; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][tax_id]" value="" /></td>';
    html += '    </tr>';&#9;&#9;&#9;
    html += '    <tr>';
    html += '      <td><span class="required">*</span> <?php echo $entry_address_1; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][address_1]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><?php echo $entry_address_2; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][address_2]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><span class="required">*</span> <?php echo $entry_city; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][city]" value="" /></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><span id="postcode-required' + address_row + '" class="required">*</span> <?php echo $entry_postcode; ?></td>';
    html += '      <td><input type="text" name="address[' + address_row + '][postcode]" value="" /></td>';
    html += '    </tr>';
&#9;html += '    <tr>';
    html += '      <td><span class="required">*</span> <?php echo $entry_country; ?></td>';
    html += '      <td><select name="address[' + address_row + '][country_id]" onchange="country(this, \'' + address_row + '\', \'0\');">';
    html += '         <option value="223"><?php echo $text_select; ?></option>';
    <?php foreach ($countries as $country) { ?>
    html += '         <option value="<?php echo $country['country_id']; ?>"><?php echo addslashes($country['name']); ?></option>';
    <?php }?>
    html += '      </select></td>';
    html += '    </tr>';
    html += '    <tr>';
    html += '      <td><span class="required">*</span> <?php echo $entry_zone; ?></td>';
    html += '      <td><select name="address[' + address_row + '][zone_id]"><option value="false"><?php echo $this->language->get('text_none'); ?></option></select></td>';
    html += '    </tr>';
&#9;html += '    <tr>';
    html += '      <td><?php echo $entry_default; ?></td>';
    html += '      <td><input type="radio" name="address[' + address_row + '][default]" value="1" /></td>';

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Thanks in advance for any help.
stoneycurtisAsked:
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mankowitzCommented:
if you include "disabled"  within the option element, you can have a disabled option

You probably want something like this:

<select name="address[<?php echo $address_row; ?>][country_id]" onchange="country(this, '<?php echo $address_row; ?>', '<?php echo $address['zone_id']; ?>');">
                   <option value=""><?php echo $text_select; ?></option>                                                         
                    <?php foreach ($countries as $country) { ?>                                                     
                    <?php if ($country['country_id'] == 223) { ?>                  
                    <option value="<?php echo $country['country_id']; ?>" disabled><?php echo $country['name']; ?></option>
                    <?php } else if ($country['country_id'] == $address['country_id']) { ?>                                      
                    <option value="<?php echo $country['country_id']; ?>" selected="selected"><?php echo $country['name']; ?></option>
                    <?php } else { ?>
                    <option value="<?php echo $country['country_id']; ?>"><?php echo $country['name']; ?></option>                    
                    <?php } ?>
                    <?php } ?>
                  </select>

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stoneycurtisAuthor Commented:
Thanks Mankowitz for your suggestion, unfortunately it didn't work, it didn't break the form, everything works as it did prior to the change. Do you think the function (Line 42 above) is over-riding?
mankowitzCommented:
possibly. lets make sure that you are supplying the right data to your function. use var_dump() to see what's in those variables.

var_dump ($address_row);
var_dump ($address);
var_dump ($text_select);
var_dump ($countries);
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