function resize(){
	var janela = $(window).getHeight();
	var top = $('top').getStyle('height').toInt();
	var main = $('main').getHeight();
	var mainContent = $('mainContent').getHeight();
	var footer = $('footer').getStyle('height').toInt();
	var somaElementos = (top + main + footer);
	var sobra = (janela - somaElementos);
	
/*
	alert(
		' janela = '+janela+
		'\n top = '+top+ 
		'\n main = '+main+
		'\n mainContent = '+mainContent+
		'\n footer = '+footer+ 
		'\n somaElementos = '+somaElementos+ 
		'\n sobra = '+sobra+
		'\n main + sobra = '+(main + sobra )+		
		'\n total Ajuste = '+(top+(main + sobra)+footer)
	);
*/
	if (janela > somaElementos) {
		$('mainContent').setStyle('height', (mainContent + sobra - 20));
		if($('materia'))
			$('materia').setStyle('height', (mainContent + sobra - 165));
	}

}

window.addEvent('load', function(){resize()});
window.addEvent('resize', function (){resize()});