/////////////////////////////////////////////////////////////////////////////////////////////////////// À̹ÌÁö ·Ñ¿À¹ö ÇÔ¼ö

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
  
}

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_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
   
   if ((a[0])== 'topmenu_01'){
  		MM_showHideLayers('apDiv1','','show','apDiv2','','hide','apDiv3','','hide','apDiv4','','hide','apDiv5','','hide','apDiv6','','hide')}
   else if ((a[0])== 'topmenu_02'){
  		MM_showHideLayers('apDiv1','','hide','apDiv2','','show','apDiv3','','hide','apDiv4','','hide','apDiv5','','hide','apDiv6','','hide')}
   else if ((a[0])== 'topmenu_03'){
  		MM_showHideLayers('apDiv1','','hide','apDiv2','','hide','apDiv3','','show','apDiv4','','hide','apDiv5','','hide','apDiv6','','hide')}
   else if ((a[0])== 'topmenu_04'){
  		MM_showHideLayers('apDiv1','','hide','apDiv2','','hide','apDiv3','','hide','apDiv4','','show','apDiv5','','hide','apDiv6','','hide')}
   else if ((a[0])== 'topmenu_05'){
  		MM_showHideLayers('apDiv1','','hide','apDiv2','','hide','apDiv3','','hide','apDiv4','','hide','apDiv5','','show','apDiv6','','hide')}  
   else if ((a[0])== 'topmenu_06'){
  		MM_showHideLayers('apDiv1','','hide','apDiv2','','hide','apDiv3','','hide','apDiv4','','hide','apDiv5','','hide','apDiv6','','show')}  	
}

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; }
}



/////////////////////////////////////////////////////////////////////////////////////////////////////// À̹ÌÁö ·Ñ¿À¹ö ÇÔ¼ö

//Grobal Variables
var layerRef="null",layerStyleRef="null",styleSwitch="null";

<!----- General Setup And Starting -->
function init(){
	if (navigator.appName=="Netscape"){
		layerStyleRef="layer.";
        layerRef="document.layers";
        styleSwitch="";
    }else{
        layerStyleRef="layer.style";
        layerRef="document.all";
        styleSwitch=".style";
    }
}
<!------- Show And Hide Funcion ----------->
function showLayer(layerName){
        eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"');
}                        

function hideLayer(layerName){
        eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"');
}

function hideLayer_all(){
	document.all.MenuLayer1.style.visibility="hidden";
	document.all.MenuLayer2.style.visibility="hidden";	
	document.all.MenuLayer3.style.visibility="hidden";
	document.all.MenuLayer4.style.visibility="hidden";
	document.all.MenuLayer5.style.visibility="hidden";
	document.all.MenuLayer6.style.visibility="hidden";
}

init();