function arrange() {
	var obj = window;

	if( window.opera ) {					//opera
		var w = obj.innerWidth;
		var h = obj.innerHeight;
	} else if( document.all ){				//ie4-
		var w = obj.document.body.clientWidth;
		var h = obj.document.body.clientHeight;

	} else if( document.getElementById ){			//firefox, netscape6-, safari
		var w = obj.innerWidth;
		var h = obj.innerHeight;
	}


	var main_style = document.getElementById("main").style;
	main_style.height = ( h - 70 ) + "px";
}



	window.onload = arrange;
	window.onresize = arrange;