//new Effect.Opacity('cortina',{duration:1,from:0.0, to: 0.8})
function getPageSize() {
		
	 var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}

	return [pageWidth,pageHeight];			
}	

function findPosX(obj)
{
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj)
{
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}
function mostraTela(){
	var medidaTela = getPageSize();
	document.getElementById('cortina').style.width = medidaTela[0] + 'px';	
	document.getElementById('cortina').style.height = medidaTela[1] + 'px';		
	new Effect.Opacity('cortina',{duration:1,from:0.0, to: 0.8})
}
   
function mostraMenu(obj, obj2){
	var pos1 = findPosX(obj);
	var pos2 = findPosY(obj);
	document.getElementById(obj2).style.display = '';
	document.getElementById(obj2).style.top = pos2 + 31 + 'px';
	document.getElementById(obj2).style.left = pos1 + 'px';	
}

function escondeMenu(obj){
	document.getElementById(obj).style.display = 'none';
}

function doSubmit(acao, idForm)
{
	form = document.getElementById(idForm);
	form.action = acao;
	form.submit();
	
}
function validaFormContact()
{
	if(document.getElementById('nome').value == "")
	{
		alert("Campo Nome é obrigatório");
		return false;
	}
	
	if(document.getElementById('email').value == "")
	{
		alert("Campo email é obrigatório");
		return false;
	}
	
	if(document.getElementById('comentario').value == "")
	{
		alert("Campo comentário é obrigatório");
		return false;
	}
	
	return true;
}