function listbox_move(listID, direction) {
  
    var listbox = document.getElementById(listID);
    var selIndex = listbox.selectedIndex;
  
    if(-1 == selIndex) {
        alert("Please select an option to move.");
        return;
    }
  
    var increment = -1;
    if(direction == 'up')
        increment = -1;
    else
        increment = 1;
  
    if((selIndex + increment) < 0 ||
        (selIndex + increment) > (listbox.options.length-1)) {
        return;
    }
  
    var selValue = listbox.options[selIndex].value;
    var selText = listbox.options[selIndex].text;
    listbox.options[selIndex].value = listbox.options[selIndex + increment].value
    listbox.options[selIndex].text = listbox.options[selIndex + increment].text
  
    listbox.options[selIndex + increment].value = selValue;
    listbox.options[selIndex + increment].text = selText;
  
    listbox.selectedIndex = selIndex + increment;
}
//..
//..
 
listbox_move('countryList', 'up'); //move up the selected option
listbox_move('countryList', 'down'); //move down the selected option


//javascript/8787