function changeActive(key) {

	var sections = new Array(
		document.getElementById("ricard"), 
		document.getElementById("angel"), 
		document.getElementById("javier"),
		document.getElementById("sinapsis"));
	
	for (var i = 0; i < 4; i ++) {
	
		sections[i].setAttribute("class", "");

		sections[i].setAttribute("className", "");
	
	}
	sections[(key-1)].setAttribute("class", "activa");

	sections[(key-1)].setAttribute("className", "activa");
	

	
	
}