var tar;
var mw = 935;
var mh = 550;

function setTar(){
	tar = document.getElementById("main");
	checkWin();
}

function setTimer(){
	var _timer = setTimeout("checkWin()", 100);
}

function checkWin(){
	var size = getWinsize();
	tar.style.marginTop = (size.h > mh)? "-275px":"0";
	tar.style.marginLeft = (size.w > mw)? "-467px": "0";
	tar.style.top = (size.h > mh)? "50%":"0";
	tar.style.left = (size.w > mw)? "50%": "0";
	setTimer();
}

function getWinsize(){
	var _obj = new Object();
	if(window.innerHeight){
		_obj.w = window.innerWidth;
		_obj.h = window.innerHeight;
	}else if (document.all && document.getElementById && (document.compatMode=='CSS1Compat')) {
		_obj.w = window.clientWidth;
		_obj.h = document.documentElement.clientHeight;
	}else if(document.body.clientHeight){
		_obj.w = document.body.clientWidth;
		_obj.h = document.body.clientHeight;
	}else{
		_obj.w = 0;
		_obj.h = 0;
	}
	return _obj;
}