function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

var old_layer_index = 0;
var category_length = 0;

function show_mlayer(index) {

	var now_winwidth = document.body.clientWidth;

	var left_margin  = 0;
	if (now_winwidth > 900) {
		left_margin = (now_winwidth - 900) / 2;
	}
	
	var layer_name = "smenu"+index;
	var top_start = 119;
	var left_start = 90;
	var layer_interval = 29;

	if (old_layer_index != 0 && old_layer_index != index) {
		var old_layer_name = "smenu"+old_layer_index;
		document.all[old_layer_name].style.visibility = "hidden";
	}

	old_layer_index = index;

	hide_mlayer_exclusive(index);
	document.all[layer_name].style.top = top_start + (index-1)*layer_interval;
	document.all[layer_name].style.left = left_margin + left_start;
	document.all[layer_name].style.visibility = "visible";
}

function hide_mlayer_exclusive(index) {
	for (var i = 1; i <= category_length; i++) {
		if (i != index) document.all["smenu"+i].style.visibility = "hidden";

	}
}

function hide_mlayer(index) {
	var layer_name = "smenu"+index;
	document.all[layer_name].style.visibility = "hidden";
}