function checkRes()
{
	
if (screen.width >=1280)
{
	var maxWidth = 1180;
	document.getElementById('stylelink').href = 'style1280.css';
	document.body.style.width = maxWidth;
	document.body.style.marginLeft = (eval(screen.width)-maxWidth)/2;
	document.body.style.marginRight = (eval(screen.width)-maxWidth)/2;
	} else {
		if (screen.width >= 1024)
		{
			document.getElementById('stylelink').href = 'style1024.css';
		} else {
			if (screen.width >=800)
			{
				document.getElementById('stylelink').href = 'style800.css';
			}
		}
	}	
}