function menu1(){
	document.getElementById("sub_area_01").style.display="block";
	document.getElementById("sub_area_02").style.display="none";
	document.getElementById("sub_area_03").style.display="none";
	document.getElementById("sub_area_04").style.display="none";
	document.getElementById("sub_area_05").style.display="none";
	document.getElementById("sub_area_06").style.display="none";
	document.getElementById("btn_01").src="images/top_menu_01_on.gif";
	document.getElementById("btn_02").src="images/top_menu_02_off.gif";
	document.getElementById("btn_03").src="images/top_menu_03_off.gif";
	document.getElementById("btn_04").src="images/top_menu_04_off.gif";
	document.getElementById("btn_05").src="images/top_menu_05_off.gif";
	document.getElementById("btn_06").src="images/top_menu_06_off.gif";
	
	}
function menu2(){
	document.getElementById("sub_area_01").style.display="none";
	document.getElementById("sub_area_02").style.display="block";
	document.getElementById("sub_area_03").style.display="none";
	document.getElementById("sub_area_04").style.display="none";
	document.getElementById("sub_area_05").style.display="none";
	document.getElementById("sub_area_06").style.display="none";
	document.getElementById("btn_01").src="images/top_menu_01_off.gif";
	document.getElementById("btn_02").src="images/top_menu_02_on.gif";
	document.getElementById("btn_03").src="images/top_menu_03_off.gif";
	document.getElementById("btn_04").src="images/top_menu_04_off.gif";
	document.getElementById("btn_05").src="images/top_menu_05_off.gif";
	document.getElementById("btn_06").src="images/top_menu_06_off.gif";
	}
function menu3(){
	document.getElementById("sub_area_01").style.display="none";
	document.getElementById("sub_area_02").style.display="none";
	document.getElementById("sub_area_03").style.display="block";
	document.getElementById("sub_area_04").style.display="none";
	document.getElementById("sub_area_05").style.display="none";
	document.getElementById("sub_area_06").style.display="none";
	document.getElementById("btn_01").src="images/top_menu_01_off.gif";
	document.getElementById("btn_02").src="images/top_menu_02_off.gif";
	document.getElementById("btn_03").src="images/top_menu_03_on.gif";
	document.getElementById("btn_04").src="images/top_menu_04_off.gif";
	document.getElementById("btn_05").src="images/top_menu_05_off.gif";
	document.getElementById("btn_06").src="images/top_menu_06_off.gif";
	}
function menu4(){
	document.getElementById("sub_area_01").style.display="none";
	document.getElementById("sub_area_02").style.display="none";
	document.getElementById("sub_area_03").style.display="none";
	document.getElementById("sub_area_04").style.display="block";
	document.getElementById("sub_area_05").style.display="none";
	document.getElementById("sub_area_06").style.display="none";
	document.getElementById("btn_01").src="images/top_menu_01_off.gif";
	document.getElementById("btn_02").src="images/top_menu_02_off.gif";
	document.getElementById("btn_03").src="images/top_menu_03_off.gif";
	document.getElementById("btn_04").src="images/top_menu_04_on.gif";
	document.getElementById("btn_05").src="images/top_menu_05_off.gif";
	document.getElementById("btn_06").src="images/top_menu_06_off.gif";
	}
function menu5(){
	document.getElementById("sub_area_01").style.display="none";
	document.getElementById("sub_area_02").style.display="none";
	document.getElementById("sub_area_03").style.display="none";
	document.getElementById("sub_area_04").style.display="none";
	document.getElementById("sub_area_05").style.display="block";
	document.getElementById("sub_area_06").style.display="none";
	document.getElementById("btn_01").src="images/top_menu_01_off.gif";
	document.getElementById("btn_02").src="images/top_menu_02_off.gif";
	document.getElementById("btn_03").src="images/top_menu_03_off.gif";
	document.getElementById("btn_04").src="images/top_menu_04_off.gif";
	document.getElementById("btn_05").src="images/top_menu_05_on.gif";
	document.getElementById("btn_06").src="images/top_menu_06_off.gif";
	}
function menu6(){
	document.getElementById("sub_area_01").style.display="none";
	document.getElementById("sub_area_02").style.display="none";
	document.getElementById("sub_area_03").style.display="none";
	document.getElementById("sub_area_04").style.display="none";
	document.getElementById("sub_area_05").style.display="none";
	document.getElementById("sub_area_06").style.display="block";
	document.getElementById("btn_01").src="images/top_menu_01_off.gif";
	document.getElementById("btn_02").src="images/top_menu_02_off.gif";
	document.getElementById("btn_03").src="images/top_menu_03_off.gif";
	document.getElementById("btn_04").src="images/top_menu_04_off.gif";
	document.getElementById("btn_05").src="images/top_menu_05_off.gif";
	document.getElementById("btn_06").src="images/top_menu_06_on.gif";
	}

//글자 확대/축소
function resizeH(obj) {
	var obj_document = obj.contentWindow.document;
	if(obj_document.height){
		obj.style.height = obj_document.height;
	} else {
		obj.style.height = obj_document.body.scrollHeight;
	}
}
// cookie
function setCookie(name, value, expires, path, domain, secure) {
  document.cookie = name + "=" + escape(value) +
  ((expires == null) ? "" : "; expires=" + expires.toGMTString()) +
  ((path == null) ? "" : "; path=" + path) +
  ((domain == null) ? "" : "; domain=" + domain) +
  ((secure == null) ? "" : "; secure");
}

// cookie 
function delCookie (name,path,domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path == null) ? "" : "; path=" + path) +
    ((domain == null) ? "" : "; domain=" + domain) + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
  //
  document.location.reload();
}

var firstCall = true;

function changeFontsize(fSize, increment) {
	if (firstCall) {
		firstCall = false;
		if (increment != "") {
			changeFontsize('12', '');
		}
	}

	if (document.getElementsByTagName) {
		var getElement = document.getElementsByTagName("*");
		var eachElement, currentFontSize, fontIncrease, newFontSize;
		for (i=0; i<getElement.length; i++) {
			eachElement = getElement[i];
			if (increment != "") {
				currentFontSize = parseInt(eachElement.style.fontSize);
				fontIncrease = parseInt(increment);
				newFontSize = currentFontSize + fontIncrease;
			}
			else if (fSize != "") {
				newFontSize = parseInt(fSize);
			}
			if (getElement[i].tagName == "LI") {
				eachElement.style.lineHeight = Math.round(newFontSize*1.2) + "px";
			} else {
				eachElement.style.lineHeight = Math.round(newFontSize*1.5) + "px";
			}
			if (fSize != "") {
				switch(getElement[i].tagName) {
					case "H2": newFontSize += 3; break;
					case "H3": newFontSize += 2; break;
					case "H4": newFontSize += 1; break;
					case "H5": newFontSize += 1; break;
					case "H6": newFontSize += 1;
				}
			}
			eachElement.style.fontSize = newFontSize + "px";
			setCookie('fontSize', newFontSize);
		}
	}
	return false;
}