function carregaCarrinho(id,acao)
{	
	endereco = window.location.href;
	arquivo = endereco.lastIndexOf("/");
	arquivo = endereco.substring(arquivo+1 , endereco.lastIndexOf("."));
	if(arquivo == 'confirma_compra')
	{
		return;	
	}
	carAjax = criaAjax();
	
	divCarrinho = document.getElementById('mostraCarrinho');
	
	address = window.location.href;
	file = address.lastIndexOf("/");
	file = address.substring(file+1 , address.lastIndexOf("."));
	if(file == 'detalhes')
	{
		qnt = document.getElementById('qtde').value; 	
		impress = document.getElementById('impressao').value;
	}
	else
	{
		qnt = 0;
		impress = 0;
	}

	if (acao == 'inserir' && qnt == 0) { 
		alert("Digite a quantidade que deseja orçar"); 
		return false;   
	}

	var parametros = '?id=' + id + '&acao=' + acao + '&qtde=' + qnt + '&impressao=' + impress;
	carAjax.open('get','_carrinho.php' + parametros,true);
	carAjax.onreadystatechange = mostraCarrinho;	
	carAjax.send(null);
}


function mostraCarrinho()
{
	if(carAjax.readyState==4)
	{
		if(carAjax.responseText)
		{   
			divCarrinho.innerHTML = carAjax.responseText;	
		}
		else
		{
			divCarrinho.innerHTML = 'Pobrema no carrinho';	
		}
	}
}



function hide_carrinho()
{
	address = window.location.href;
	file = address.lastIndexOf("/");
	file = address.substring(file+1 , address.lastIndexOf("."));
	if(file == 'confirma')
	{
		document.getElementById('mostraCarrinho').style.display = "none";
	}
	else
	{
		document.getElementById('mostraCarrinho').style.display = "block";
	}
		
}