last_expanded='';

function showHide(id) {
    var obj = document.getElementById(id);
    var status = obj.className;
    /*if (status == "hide") {
        if (last_expanded != "") {
            var last_obj = document.getElementById(last_expanded);
            last_obj.className = "hide";
        }
        obj.className = "show";
        last_expanded = id;
    } else {
        if (last_expanded != id) {
            obj.className = "hide";
        }
    }*/
	var i=1;
	obj2=document.getElementById("a"+i);
	while(obj2){
		obj2.className="hide";
		i++;
		obj2=document.getElementById("a"+i);
	}
	if (status == "hide") {
       obj.className = "show";	
	}
}