function newsletter() {
	
	total_erros=0;
	foc="";
	
	if(document.getElementById('form_newsletter').nome.value=="Nome"){		
		foc="nome";
		total_erros++;
	}else{
		foc="";		
	}
	
	if(document.getElementById('form_newsletter').email.value=="E-mail"){	
		total_erros++;
		if(foc==""){
			foc="email";	
		}
	}else{
		foc="";			
	}
	
	if(foc=="nome"){
		document.getElementById('form_newsletter').nome.focus();
	}
	if(foc=="email"){
		document.getElementById('form_newsletter').email.focus();
	}
	
	if(total_erros==0){					
			$.ajax({
			   type: "POST", 
			   dataType: 'html',		
			   data :$('#form_newsletter').serialize(), //envia todos os campos
			   url: 'php/cadastra_newsletter_emails.php',
			   cache:false,			  
			   success: function(data){											
					 $("#resposta").html(data);						 
					 $("#janela_informacao").dialog("open");							 
					 document.getElementById('form_newsletter').reset(); //limpa os campos
				} 			   
			  });//fim ajax
		}
}