function doClick(o){
o.className="nav_search";
var j;
var id;
var e;
for(var i=1;i<=3;i++){
id ="nav"+i;
j = document.getElementById(id);
e = document.getElementById("sear"+i);
if(id != o.id){
j.className="nav_link";
e.style.display = "none";
}else{
e.style.display = "block";
}
}
}