function Numerico(e) 
{
	e = (e)?e:window.event;
	keyCode=(e.keyCode)?e.keyCode:e.which;
	if(keyCode > 47 && keyCode < 58) 
		return true;
	else if (keyCode == 46 || keyCode == 9 || keyCode ==11 || keyCode==13||keyCode == 8||keyCode==36||keyCode==118||keyCode==35 )
		return true;
	else
		return false;
} 

function Decimal(e) 
{
	e = (e)?e:window.event;
	keyCode=(e.keyCode)?e.keyCode:e.which;
	
	if(keyCode > 47 && keyCode < 58) 
		return true;
	else if (keyCode == 8)
		return true;
	else if (keyCode == 46 || keyCode == 9 || keyCode ==11 || keyCode==13||keyCode == 8||keyCode==36||keyCode==118||keyCode==35 )
		return true;
	else
		return false;
} 
function Alfanumerico(e) 
{
	return true;
}


function validarLogin()
{
    if (document.getElementById("txt_usuario"))
    {
        if (document.getElementById("txt_usuario").value =="")
        {
            document.getElementById("txt_usuario").focus();
            alert("Favor de ingresar su usuario");
            return false;
        }
    }
    if (document.getElementById("txt_contrasena").value =="")
        {
            document.getElementById("txt_contrasena").focus();
            alert("Favor de ingresar su contraseņa");
            return false;
        }
    return true;
}