Copy Billing Info To Shipping Info

copy-data.js

<script>
//on page load
$(document).ready( function () {

	//when the checkbox is checked or unchecked
	$('#copyaddress').click(function() {
		
		// If checked
		if($('#copyaddress').is(':checked')) {
			
			//for each input field
			$('#shipping input', ':visible', document.body).each(function(i) { 
			
			//copy the values from the billing_fields inputs
			//to the equiv inputs on the shipping_fields
				$(this).val( $('#billing input').eq(i).val() );
			});
			            
			//won't work on drop downs, so get those values
      var bcountry = $("#country_code").val();
      
      // special for the select
      $('select#shipping_country_code option[value=' + bcountry + ']').attr('selected', 'selected');
      
		}
		else {
		
			//for each input field
			$('#shipping input', ':visible', document.body).each(function(i) { 
			
				// put default values back
	     	$(this).val($(this)[0].defaultValue);
	    });
	     
			 // special for the select
			 $('select#shipping_country_code option[value=""]').attr('selected', 'selected');
			 
		} // end if else
		
	});
	
});
</script>

Needs the select plugin to enable select boxes to change: https://github.com/SamWM/jQuery-Plugins