// document.domain = "rda.go.kr";
// Main Menu Layer
var SubMenuArray = Array("sub_menu1","sub_menu2","sub_menu3","sub_menu4","sub_menu5");

// À̹ÌÁö ¿À¹ö ÇÔ¼ö
function imgChg(obj){
	var img = null;
	var imgName = null;
	
	// A °´Ã¼¿¡¼­ IMG°´Ã¼¸¦ ÃßÃâ
	// Á¢±Ù¼ºÀ» À§ÇØ ¿À¹ö À̹ÌÁöÀÇ ÄÁÆ®·ÑÀº A¿¡¼­ À̺¥Æ®¸¦ °É¾î 󸮵ǵµ·Ï ÇÔ.
	if(obj != null){
		for(i=0; i<obj.childNodes.length; i++){
			if(obj.childNodes[i].nodeName == "IMG"){
				img = obj.childNodes[i];
			}
		}
	}

	if(img != null){
		imgName = img.src;
		if(imgName.indexOf("_on") > -1){
			img.src = imgName.replace(/_on\.gif/g, ".gif");
		}else{
			img.src = imgName.replace(/\.gif/g, "_on.gif");
		}
	}
}

function MainMenu(obj, id){
	// À̹ÌÁö ¿À¹ö
	imgChg(obj);
	// MainMenu ·¹À̾î Display
	for(i=0; i<SubMenuArray.length; i++){
		if(SubMenuArray[i] == id){
			eval("document.getElementById('"+id+"')").style.display = "block";
		}else{
			document.getElementById(SubMenuArray[i]).style.display = "none";
		}
	}
}

function MainMenuClose(){
	// MainMenu Display : none
	for(i=0; i<SubMenuArray.length; i++){
		document.getElementById(SubMenuArray[i]).style.display = "none";
	}
}



<!--
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_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_findObj(n, d) { //v4.0
  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 && document.getElementById) x=document.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];}
}

function swapImg() { 
	var img  = event.srcElement; 
	var argu = arguments[0];  
	if(typeof(argu) == "string") {  
		img.onload="";  
		img.attachEvent("onmouseover",swapImg);
		img.attachEvent("onmouseout" ,swapImg);
		img.defaultImg = img.src; 
		img.overImg    = argu; 
	} else {  
		img.src = (img.src == img.defaultImg )? img.overImg: img.defaultImg ;
	} 
} 
//-->