var error = "";
function check_news()
{	
	error = "";
	
	if (document.getElementById('txtEmail').value == 'email*')
	{
		error += "O campo 'email' é obrigatório!\n";	
	}else{
		validaNews();
		}
	if (error == "")
	{
		document.frmContact.submit();
	}
	else
	{
		alert(error);
	}
}

function validaNews()
		{
			email2='%'+document.getElementById('txtEmail').value+'%';

			var re=/\%[a-z\-\_0-9]+(\.[a-z\-\_0-9]+)*@[a-z\-\_0-9]+(\.[a-z\-\_0-9]+)*\%/i;


			var tam = document.getElementById('txtEmail').value.length;
			var varA=0;
			var varB=0;
			for (i=0;i < tam;i++)
			{
				caracter = document.getElementById('txtEmail').value.substr(i,1);

				if(caracter == '@' && varA==0)
				{
					varA = i;				
				}

				if(caracter == '.' && varA>0 && varB==0)
				{
					varB = i;				
				}		
			}

			var str1 = document.getElementById('txtEmail').value.substr(0,varA);
			var str2 = document.getElementById('txtEmail').value.substr(varA+1,varB-(varA+1));
			var str3 = document.getElementById('txtEmail').value.substr(varB+1,tam);

			if((str1.length < 2 || str2.length < 2 || str3.length < 2) || (!email2.match(re)))
			{
				error += "O campo 'email' é obrigatório!\n";	
				return false;
			}else{
				return true;
				//document.newsForm.submit();
			}
		}