function cambiar4(){
	         var sec=document.getElementById('selected_4');
	         sec.className="selected";
	         sec=document.getElementById('selected_1');
	         sec.className="";
	         sec=document.getElementById('selected_2');
	         sec.className="";
	         sec=document.getElementById('selected_3');
	         sec.className="";

 }
function cambiar3(){
	         var sec=document.getElementById('selected_3');
	         sec.className="selected";
	         sec=document.getElementById('selected_1');
	         sec.className="";
	         sec=document.getElementById('selected_2');
	         sec.className="";
	         sec=document.getElementById('selected_4');
	         sec.className="";

 }
function cambiar2(){
	         var sec=document.getElementById('selected_2');
	         sec.className="selected";
	         sec=document.getElementById('selected_1');
	         sec.className="";
	         sec=document.getElementById('selected_3');
	         sec.className="";
	         sec=document.getElementById('selected_4');
	         sec.className="";
}
function cambiar1(){
	         var sec=document.getElementById('selected_1');
	         sec.className="selected";
	         sec=document.getElementById('selected_4');
	         sec.className="";
	         sec=document.getElementById('selected_3');
	         sec.className="";
	         sec=document.getElementById('selected_2');
	         sec.className="";
}