var sideBarOpened = 0;

function slideSideBar(){

  if(sideBarOpened==0){
    new Effect.Move('sideBar', {x: 290, y: 0, mode: 'relative', transition: Effect.Transitions.spring });
    sideBarOpened++;
  } else{
    new Effect.Move('sideBar', {x: -290, y: 0, mode: 'relative', transition: Effect.Transitions.spring });
    sideBarOpened=0;
  }

}

/*
function init(){
  Event.observe('sideBarTab', 'click', slideSideBar, true);
}

Event.observe(window, 'load', init, true);
*/