Amigo esto es un pequeño ejemplo que quizás pueda servirle. Saludos
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script language="javascript">
function Mostrar(valor){
if(valor == 1)
{
document.getElementById('1').style.display = "block";
document.getElementById('2').style.display = "none";
document.getElementById('3').style.display = "none";
}
else if(valor == 2)
{
document.getElementById('1').style.display = "none";
document.getElementById('2').style.display = "block";
document.getElementById('3').style.display = "none";
}else if(valor == 3)
{
document.getElementById('1').style.display = "none";
document.getElementById('2').style.display = "none";
document.getElementById('3').style.display = "block";
}
else
{
document.getElementById('1').style.display = "none";
document.getElementById('2').style.display = "none";
document.getElementById('3').style.display = "none";
}
}
</script>
</head>
<body>
<p>
<select name="select" onchange="Mostrar(this.options[this.options.selectedIndex].value);">
<option value="" selected>--Seleccione--</option>
<option value="1">deposito</option>
<option value="2">transferencia</option>
<option value="3">mercadopago</option>
</select>
</p>
<table id="1" width="50%" border="1" style="display:none">
<tr>
<td>Deposito</td>
</tr>
</table>
<table id="2" width="50%" border="1" style="display:none">
<tr>
<td>transferencia</td>
</tr>
</table>
<table id="3" width="50%" border="1" style="display:none">
<tr>
<td>Mercado Pago </td>
</tr>
</table>
<p> </p>
</body>
</html>