function onBodyLoad() {
	
	mask();
	setupZoom();
	return true;
}

function changeMaskPosition() {
	var main_bg = document.getElementById("mask");
	var content = document.getElementById("content");
	var body = document.getElementsByTagName("body")[0];
	var left = (body.offsetWidth - content.offsetWidth) / 2;
	if(left < 0) {
		left = 0;
	}
	
	main_bg.style.left = left + "px";
	main_bg.style.display="block";
}

function mask() {

	var main_bg = document.getElementById("mask");

	window.onresize = function() {
		changeMaskPosition();
	}
	changeMaskPosition();
	main_bg.onmouseover = function(e) {

		return true;
	};
	main_bg.onclick = function(e) {
		return true;
	};
	main_bg.onmousedown = function(e) {
		return true;
	};
	main_bg.onmouseover = function(e) {
		return true;
	};
}