function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
	} else if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
	}
	return windowHeight;
}

function getWindowWidth() {
	var windowWidth = 0;
	if (typeof(window.innerWidth) == 'number') {
		windowWidth = window.innerWidth;
	} else if( document.documentElement && document.documentElement.clientWidth ) {
		windowWidth = document.documentElement.clientWidth;
	} else if (document.body && document.body.clientWidth) {
		windowWidth = document.body.clientWidth;
	}
	return windowWidth;
}

function fillScreen() {
	var contentHeight = $('content').offsetHeight;
	var headerHeight = $('header').offsetHeight;
	var windowHeight = getWindowHeight();
	var footerHeight = $('footer').offsetHeight;
	if ((headerHeight + contentHeight + footerHeight + 120) < windowHeight) {
		$('content').style.height = windowHeight - headerHeight - footerHeight - 120 + 'px';
	}
}