var sit;
function setNav(nid){
	sit = nid;
	document.getElementById(nid).className = 'top_parent_n';
}
function in_n(nid) {
  document.getElementById(nid).className = 'top_parent_n';//setAttribute("border", "thin solid red", false);
}
function out_n(nid) {
	if(sit==nid){
		
	}
	else{
	  document.getElementById(nid).className = 'top_parent';//setAttribute("border", "thin solid red", false);
	}
}