prev = "";


function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

function showPanel(id,prev){
    
    if(prev == ""){   
        document.getElementById('main').style.display = "none";
    }else{
        document.getElementById(prev).style.display = "none";
    }
    obj = document.getElementById(id);
    obj.style.display = 'block'; 
}

function showReactionForm(){
    obj = document.getElementById("reactionForm");
    obj.style.display = "block";
    obj.style.visibility = "visible";    
}
function showReactions(){
    obj = document.getElementById("reactions");
    obj.style.display = "block";
    obj.style.visibility = "visible";    
}