Question

Please look at my example on jsfiddle. The blue thing is supposed to slide right and back.
Help is certainly welcome!

Answer 1

Use data to store the slide_out variable in the element, and change 0px to just 0:

$(document).ready(function(){
  $("#right_column").click(function(){
    if(!$(this).data('slide_out')){
      $("#right_column").animate({left:0},"slow");
      $(this).data('slide_out', true);
      }
    if($(this).data('slide_out')){
      $("#right_column").animate({left:-140},"slow");
      $(this).data('slide_out', false);
      }
  });
});

Look at it working here.