var initPush = function(){
   $(".push").hide();
   showPush($("#defaultPush"));
   initButton("europeanPush");
   initButton("americanPush");
   initButton("asianPush");
   initButton("africanPush");
}

var initButton = function(classCss){
   $("."+classCss).click(function () {      
      $(".push").hide();
      if($("#"+classCss).is("div")){
         showPush($("#"+classCss));
      }
      else{
         showPush($("#defaultPush"));
      }
   });   
}

var showPush = function(elt){
   elt.show();
   elt.css("top", "540px");
   elt.css("opacity", "0.1");
   elt.animate({
     top: "460px",
     opacity: 1
   }, 2500 );
}

$(document).ready(function(){
   initPush();
});