function change_tab(active){
	var cont = 0;
	while(document.getElementById("tab_"+cont)){
		document.getElementById("tab_content_"+cont).style.display = 'none';
		document.getElementById("tab_"+cont).className = "br_tab_txt color_inverted";
		cont++;
	}
	document.getElementById("tab_content_"+active).style.display = 'block';
	document.getElementById("tab_"+active).className = "br_tab_txt_seleccionado color_inverted";
}