last_tab="tab1";
function show(_1){
document.getElementById(_1).style.display="";
}
function hide(_2){
document.getElementById(_2).style.display="none";
}
function show_next(_3){
document.getElementById(last_tab).className="tab";
var _4=document.getElementById(_3);
_4.className="tab_selected";
hide(last_tab+"_data");
show(_3+"_data");
last_tab=_3;
}