function fullScreenHeight(element){ //ie6 fix thanks to http://www.huddletogether.com and http://www.quirksmode.com
	
	var yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		yScroll = document.body.offsetHeight;
	}
	
	var windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	document.getElementById(element).style.height = (pageHeight+'px');
}

function show(element){document.getElementById(element).style.display='block';}

function hide(element){document.getElementById(element).style.display='none';}

function register() {
	fullScreenHeight('overlay');
	show('overlay');
}

function doNotRegister() {
	hide('overlay');
	show('overlay-form');
	hide('overlay-response');
}

function submitRegister() {
	if (document.getElementById('estadosunidos').checked || document.getElementById('puertorico').checked) {location.href='/register';}
	else {
		hide('overlay-form');
		show('overlay-response');
	}
}