/*
 * 2008-06-25 last modify
 * 화면 확대, 축소(Explorer用, 외 alert 처리)
 */


//쿠키 굽기
setCookie_forZoom = function(name, value, expiredays) {
	//document.cookie = name + "=" + escape( value ) + "; path=/;";
	
	var todayDate = new Date();
	todayDate.setDate(todayDate.getDate() + expiredays); //오늘 날짜에 +1일 추가
	document.cookie = name + '=' + escape(value) + '; path=/; expires=' + todayDate.toGMTString() + ';'	
}


//쿠키 가지고 오기
getCookie_forZoom = function(name) {
	var nameOfCookie = name + "=";
	var x = 0;
	while(x <= document.cookie.length) {
		var y = (x+nameOfCookie.length);
		if(document.cookie.substring(x, y) == nameOfCookie) {
			if((endOfCookie=document.cookie.indexOf( ";", y)) == -1) {
				endOfCookie = document.cookie.length;
			}
			return unescape(document.cookie.substring(y, endOfCookie));
		}
		x = document.cookie.indexOf(" ", x) + 1;
		if(x == 0) {
			break;
		}
	}
	return "";
}


//현 화면 비율 가지고 오기
var currentZoomSize = eval(getCookie_forZoom("currentZoomSize"));


//화면 확대, 축소 하기
screenZoom = function(sw) {
	currentZoomSize = (currentZoomSize) ? eval(currentZoomSize) : 100;
	if(navigator.appName.indexOf("Explorer") != -1) {
		var add_val = 10; //가중치
		var minus_bound = 100; //축소 최소값
		var apply_screen_size = 0;
		var current_screen_size = (this.current_screen_size) ? this.current_screen_size : currentZoomSize;

		add_val *= (sw == 1) ? 1 : -1;
		current_screen_size += add_val;
		current_screen_size = (current_screen_size < 100) ? minus_bound : current_screen_size;
		apply_screen_size = current_screen_size + "%";
		document.body.style.zoom = apply_screen_size;
		this.current_screen_size = current_screen_size;
		setCookie_forZoom("currentZoomSize", current_screen_size, 1);
	} else {
		alert("해당 브라우저에서는 지원하지 않습니다. ");
	}
}


//변경된 화면 비율 유지하기
if(currentZoomSize) {
	document.body.style.zoom = currentZoomSize + "%";
	screenZoom.current_screen_size = eval(currentZoomSize);
}

//F5 금지
document.body.onkeydown = function() {
	var f5msg = "새로고침을 적용합니다. ";
	
	if(event.keyCode == 116) {
		alert(f5msg);
		/*
		event.keyCode = 0;
		event.returnValue = false;		
		event.cancelBubble = false;
		*/
		return false;		
	}
}