selectAll.change( function(){ if( selectAll.is(':checked') ){ langs.prop('checked',true) ; selectAllLabel.hide(); deselectAllLabel.show(); }else{ langs.prop('checked',false); selectAllLabel.show(); deselectAllLabel.hide(); } });

invertSelect.click( function(){ langs.map(function(){ var lang=$(this); lang.prop('checked',!lang.is(':checked')); }) langs.change(); });

langs.change( function(){ var judge=true; langs.map( function(){ var lang=$(this); if(!lang.is(':checked') ){ judge=false; } }) if(judge){ selectAll.prop('checked',true); selectAll.change(); }else{ selectAll.prop('checked',false); selectAllLabel.show(); deselectAllLabel.hide(); } });