	// OCULTA OBJETO----------------------------------- 
	function hide(obj){
		var elem = document.getElementById(obj);
		if(elem != null)
			elem.style.display = "none";
	}

	// ENVIA FORMULÁRIO AO PRESSIONAR ENTER -----------
	function enviarFormByKeyboard(e){
		var tecla = null;
		if (window.event)
			tecla = window.event.keyCode;
		else if (e.which)
			tecla = e.which;
		if (tecla == 13)
			enviarForm();
	}
	
	// VALIDA DATA -------------------------------------
	function validar_data(adata){
		var data_valida = /^((0?[1-9]|[12]\d)\/(0?[1-9]|1[0-2])|30\/(0?[13-9]|1[0-2])|31\/(0?[13578]|1[02]))\/(19|20)?\d{2}$/;
		return data_valida.test(adata);
	}
	
	// VALIDA HORA -------------------------------------
	function validar_hora(ahora){
		var hora_valida = /^([0-1]\d|2[0-3]):[0-5]\d$/;
		return hora_valida.test(ahora);
	}
	
	// VALIDA NÚMEROS INTEIROS -------------------------------------
	function validar_inteiro(onum){
		var num_valido = /^[1-9]\d+$/;
		return num_valido.test(onum);
	}
	
		// IMPRIME O RECIBO
	function imprimirRecibo(cod, nome, valor, data, resp) {
		text  = '<html>\n<head>\n<title>XIII Semana da F&iacute;sica</title>\n</head>\n<body>\n';
		text += '<table cellpadding="0" cellspacing="0" width="750" align="center" style="border:1px solid #666666;">\n';
		text += '<tr>\n'; 
		text += '<td><img src="images/cabecalho.jpg"></td>\n';
		text += '</tr>\n'; 
		text += '<tr>\n';
		text += '<td align="center"><b>Site: http://www.fisica.uel.br/sefis <img src="images/pt.gif" width="200" height="1"> E-mail: sefis@uel.br</b></td>\n';
		text += '</tr>\n';
		text += '<tr>\n';
		text += '<td align="center"><h2 style="margin-top:15px; margin-bottom:15px;"><u>RECIBO</u></h2></td>\n';
		text += '</tr>\n';
		text += '<tr>\n';
		text += '<td style="padding:5px 20px 0px 20px;">\n';
		text += '<h3>Recebemos de <font color="#0000FF" size="+1">'+nome+'</font> a importância de <font color="#0000FF" size="+1">'+valor+'</font> referente à inscrição para a XIII Semana da Física.</h3>\n';
		text += '<h3>Para maior clareza, firmamos o presente.</h3>\n';
		text += '<h3>Londrina, '+data+'.</h3>\n';
		text += '</td>\n';
		text += '</tr>\n';
		text += '<tr>\n';
		text += '<td align="center">_________________________________________________ <h3 style="margin-top:5px; margin-bottom:15px;">'+resp+'<br>Comissão Organizadora</h3>\n</td>\n';
		text += '</tr>\n';
		text += '<tr>\n';
		text += '<td align="right"><font size="-1">ID: '+cod+'</font></td>\n';
		text += '</tr>\n';
		text += '</table>\n';
		text += '<br><center><input type="button" value="Imprimir" onClick="window.print();"><input type="button" value="Fechar" onClick="window.close();"></center><br>\n';
		text += '</body>\n</html>';
		newWindow = window.open('','novo','width=790,height=550,scrollbars=yes');
		newWindow.document.write(text);
		newWindow.document.close();
	}