/*
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centerµÉ ³»¿ëÀº <div id="content"> </div> ¾Ö µé¾î°¡¾ß ÇÔ
*/
function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	}
	else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
		}
		else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}
function setContent() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var contentElement = document.getElementById('content');
			var contentHeight = contentElement.offsetHeight;
			if (windowHeight - contentHeight > 0) {
				contentElement.style.position = 'relative';
				contentElement.style.top = ((windowHeight / 2) - (contentHeight / 2)) + 'px';
			}
			else {
				contentElement.style.position = 'static';
			}
		}
	}
}

function showLayer(divID){
   document.getElementById(divID).style.visibility="visible";
}

function hideLayer(divID){
   document.getElementById(divID).style.visibility="hidden";
}

window.onload = function() {
	setContent();
	showLayer('content');
}
window.onresize = function() {
	setContent();
}