#obsah
{   min-width: 52.5em;
    max-width: 82em;
	text-align: center;
	margin-top: auto; 
	margin-right: auto; 
	margin-bottom: auto; 
	margin-left: auto;
	position: relative; 
    _width: expression( document.body.offsetwidth < 640 ? "52.5em" : (document.body.offsetwidth > 980 ? "82em" : "auto" ) );
	  margin-left: auto;
	  margin-right: auto;
	  margin-top: auto;
	  margin-bottom: auto;
	  text-align: center;}