if(document.getElementById){
      var start_box_1=document.getElementById("starter_map_1");
      var start_box_2=document.getElementById("starter_map_2");
      var start_box_3=document.getElementById("starter_map_3");
      var start_box_4=document.getElementById("starter_map_4");
      
      var box_1=document.getElementById("box_premio_esso");
      var box_2=document.getElementById("box_edicao_atual");
      var box_3=document.getElementById("box_edicoes_anteriores");
      var box_4=document.getElementById("box_busca");
      
	  start_box_1.onmouseover=function(){
        box_1.className="showItem";
        box_2.className="hideItem";
        box_3.className="hideItem";
		box_4.className="hideItem";
      };
      start_box_2.onmouseover=function(){
        box_1.className="hideItem";
        box_2.className="showItem";
        box_3.className="hideItem";
		box_4.className="hideItem";
      };
      start_box_3.onmouseover=function(){
        box_1.className="hideItem";
        box_2.className="hideItem";
        box_3.className="showItem";
		box_4.className="hideItem";
      };
      start_box_4.onmouseover=function(){
        box_1.className="hideItem";
        box_2.className="hideItem";
        box_3.className="hideItem";
		box_4.className="showItem";
      };  

	  box_1.onmouseover=function(){
        box_1.className="showItem";
      };
      box_2.onmouseover=function(){
        box_2.className="showItem";
      };
      box_3.onmouseover=function(){
        box_3.className="showItem";
      };
      box_4.onmouseover=function(){
        box_4.className="showItem";
      };
	  
      box_1.onmouseout=function(){
        box_1.className="hideItem";
      };
      box_2.onmouseout=function(){
        box_2.className="hideItem";
      };
      box_3.onmouseout=function(){
        box_3.className="hideItem";
      };
      box_4.onmouseout=function(){
        box_4.className="hideItem";
      };
      
    }