window.addEvent('domready', function() {									 
	setHeight();
});

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

function setBG() {
	$('cerabox-background').setStyles({'opacity':'.8'});
}


function setHeight() {
	var sSizeFooternav = $('footer_page').getSize();	
	var sSizeContent = $('main').getSize();
	var sSizeWindow = window.getSize();
	var sBorder = sSizeWindow.y - sSizeFooternav.y;	
	
	if (sSizeContent.y < sBorder) {
		$('main').setStyle('height', sBorder);
	}
}