var nowZoom = 100; // ÇöÀçºñÀ²
var maxZoom = 150; // ÃÖ´ëºñÀ²(500À¸·ÎÇϸé 5¹è±îÁö Ä¿Áø´Ù)
var minZoom = 80;  // ÃÖ¼ÒºñÀ²

function zoomInOut(value) {

	var browser = navigator.userAgent.toLowerCase();
	if(browser.indexOf('msie') == -1){ //ºê¶ó¿ìÀú üũ
		alert("ÀͽºÇ÷η¯¿¡¼­¸¸ µ¿ÀÛÇÕ´Ï´Ù. \nºê¶ó¿ìÀú ¸Þ´ºÀÇ È®´ëÃà¼Ò ±â´ÉÀ» ÀÌ¿ëÇϼ¼¿ä.") ;//Ÿºê¶ó¿ìÀú »ç¿ë½Ã °æ°íâ
	}else {

		if(value == "in") {  //valueÀÇ °ªÀÌ inÀ϶§
			if (nowZoom < maxZoom) { // ÇöÀç ºñÀ²ÀÌ ÃÖ°í ºñÀ²º¸´Ù ÀÛÀ»¶§
				nowZoom += 10;           //10%¾¿ ¹èÀ²À» Áõ°¡½ÃÅ´
			} else {
				alert("´õÀÌ»ó Ä¿ÁöÁö ¾Ê½À´Ï´Ù."); //À§¿¡ ¼³Á¤ÇÑ ÃÖ´ëºñÀ²¸¸Å­ Ä¿Á³À»¶§ °æ°íâ
				return;
			}
		}
		else if(value == "out") { //valueÀÇ °ªÀÌ outÀ϶§
			if (nowZoom > minZoom) { //ÇöÀç ºñÀ²ÀÌ ÃÖÀú ºñÀ²º¸´Ù Ŭ¶§
				nowZoom -= 10;           //10%¾¿ ¹èÀ²À» °¨¼Ò½ÃÅ´
			} else {
				alert("´õÀÌ»ó ÀÛ¾ÆÁöÁö ¾Ê½À´Ï´Ù."); //À§¿¡ ¼ºÁ¤ÇÑ ÃÖ¼Ò°ªºñÀ²¸¸Å­ ÀÛ¾ÆÁ³À»¶§ °æ°íÀå
				return;
			}
		}
		else if(value == "base") { //±âº»»çÁî (//valueÀÇ °ªÀÌ baseÀ϶§)
			nowZoom = 100;
		}
		else {
			return;
		}

		document.getElementsByTagName("body").item(0).style.position = "relative";
		document.getElementsByTagName("body").item(0).style.zoom = nowZoom + "%";
	}
}