function LayerOn(layer){
    for (i=1;i<7;i++)
		{
			aa=eval("layer"+i+".style.display='none'");
		}
		layer.style.display='block';	
}

function LayerOff(num){
		for (i=1;i<7;i++){
			aa=eval("layer"+i+".style");
			aa.display='none';
		}
		if(num ==1 )layer1.style.display='block';
		if(num ==2 )layer2.style.display='block';			
		if(num ==3 )layer3.style.display='block';			
		if(num ==4 )layer4.style.display='block';
		if(num ==5 )layer5.style.display='block';
		if(num ==6 )layer6.style.display='block';
}

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) { //v3.0
  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); 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 MM_openBrWindow(theURL,winName,features) { //v2.0
	window.open(theURL,winName,features);
}

<!-- ResearchSubMenuLayer °ü·Ã JavaScript -->
function ResearchSubMenuLayerOn(layer){
	for (num=1;num<9;num++)
	{
		if(num ==1 )R_layer1.style.display='block';
		if(num ==2 )R_layer2.style.display='block';			
		if(num ==3 )R_layer3.style.display='block';			
		if(num ==4 )R_layer4.style.display='block';
		if(num ==5 )R_layer5.style.display='block';
		if(num ==6 )R_layer6.style.display='block';
		if(num ==7 )R_layer7.style.display='block';
		if(num ==8 )R_layer8.style.display='block';
	}
}

function ResearchSubMenuLayerOff(num){
	for (num=1;num<9;num++)
	{
		if(num ==1 )R_layer1.style.display='none';
		if(num ==2 )R_layer2.style.display='none';			
		if(num ==3 )R_layer3.style.display='none';			
		if(num ==4 )R_layer4.style.display='none';
		if(num ==5 )R_layer5.style.display='none';
		if(num ==6 )R_layer6.style.display='none';
		if(num ==7 )R_layer7.style.display='none';
		if(num ==8 )R_layer8.style.display='none';
	}
}
<!-- #End# ResearchSubMenu °ü·Ã JavaScript Á¾·á -->