function formatLyout(){

	//margintop = parseInt((parseInt(document.documentElement.clientHeight)-parseInt(document.getElementById('main_sub').style.height))/2);
	//document.getElementById('main_sub').style.marginTop = (margintop>0?margintop:0)  + 'px'
	
	var v = document.body.clientHeight>document.documentElement.clientHeight?document.body.clientHeight:document.documentElement.clientHeight;	
	document.getElementById('main').style.marginTop = (parseInt(v)-610>10?parseInt(((v)-610)/2):10) + 'px';

}

formatLyout();

window.onresize = formatLyout;