function moveBG() {		
		var c = document.body;
//		alert(document.body.clientHeight + " " + window.innerHeight);
		
		if(document.body.clientWidth < c.offsetWidth) winW = c.offsetWidth;
		else winW = document.body.clientWidth;
		
		if(document.body.clientHeight < c.offsetHeight) winH = c.offsetHeight;
		else winH = document.body.clientHeight;

		var bg = document.getElementById('bg');
		bg.style.width = winW + (1573 - winW)/2;
		bg.style.height = winH + (1181 - winH)/2;
		bg.style.top = -(1181 - winH)/2;
		bg.style.left = -(1573 - winW)/2;
	}
	
	function setBG(bgImage) {
		//document.body.style.backgroundImage = 'url(' + bgImage +')';
		document.body.background = bgImage;
	}