var fldname = 'RCountry';         // set the name of your country field

// select your default country from the following
var aus = 'selected="selected"'; // Australia - selected as default
var can = '';                    // Canada
var fra = '';                    // France
var ger = '';                    // Germany
var nz = '';                     // New Zealand
var uk = '';                     // United Kingdom
var us = '';                     // United States
var xx = '';                     // add null entry and select as default

document.writeln('<select name="' + fldname + '" id="' + fldname + '" class="TextBox1">');
if (xx != '') document.writeln('<option selected="selected"> </option>');
document.writeln('<option ' + aus + '>Australia</option><option ' + nz + '>New Zealand</option></select>');