function valida() {
	  with(document.form) {
		if(Usuario.value=='' || Usuario.value==' '){
			div_balao('Informe a matrícula!','Usuario');
			document.form.Usuario.focus();
		}else{
			var user=document.form.Usuario.value.split("-");
			document.form.Usuario.value=user[0];
			document.form.action='cgi-bin/autentica.dll/extrato';
			submit();
		}	
	}
}

/* Verifica se existe algum valor no campo e evita que a tecla
enter envie o formulário */
function enter(event){
	var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
		if (keyCode == 13){
			valida();
			return false;
		}else if ((keyCode>47 && keyCode<58) || (keyCode==8) || (keyCode==45)|| (keyCode>=37 && keyCode<=40 ) || (keyCode==46)){
			if (document.getElementById("balao")){
				EscondeDiv();
			}
			return true;
		
		}else{
			if (document.getElementById("balao")){
				EscondeDiv();
			}
			return false;
		}
}