function pageWidth() {
	return window.innerWidth != null? window.innerWidth: document.body != null? document.body.clientWidth:null;
}
function pageHeight() {
	return window.innerHeight != null? window.innerHeight: document.body != null? document.body.clientHeight:null;
}

window.onload = function(){
	document.getElementById('corpo').style.width = pageWidth()-160;
}