function _exit_no_content is deprecated in version 1.1
code refactoring and documentation completed
code refactoring and documentation completed
code refactoring and documentation completed
this class is depecated in v1.1 and need not be used again
[bugfix]: introduced seperate session variables for admin and public
[bugfix]: changed function prepare_filter_query
code refactoring and documentation completed
display alert function changed
code refactoring and documentation completed
function get_pixmap_url added
function _exit_no_content removed