function previous_image() {
	var image_name = parseInt($('#image_name').val());
	var number_of_images = parseInt($('#numOfImages').val())
	tmp_name=(image_name==1) ? number_of_images : image_name-1; 
	$('#showCaseImage').attr('src', $('#baseUrl').val()+tmp_name+'.jpg');
	$('#image_name').val(tmp_name);
	
}	
	
function next_image() {
	var image_name = parseInt($('#image_name').val());
	var number_of_images = parseInt($('#numOfImages').val())
	tmp_name=(image_name==number_of_images) ? 1 : image_name+1; 
	$('#showCaseImage').attr('src', $('#baseUrl').val()+tmp_name+'.jpg');
	$('#image_name').val(tmp_name);	
}