function CheckLogin(f)
{	if (f.customer_login.value=="" || f.customer_login.value=="jméno")
	{	alert('Zadejte přihlašovací jméno ...');
		f.customer_login.focus();
		return false;
	}
	if (f.customer_password.value=="" || f.customer_password.value=="heslo")
	{	alert('Zadejte heslo ...');
		f.customer_password.focus();
		return false;
	}
	return true;
}

function cislaplus(myfield, e, plus)
{	var key; var keychar;
	if (window.event) key = window.event.keyCode;
	else if (e) key = e.which; else return true;
	keychar = String.fromCharCode(key);
	if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) ) return true;
	else if ((("0123456789"+plus).indexOf(keychar) > -1)) return true; else return false;
}

function checkMail(email)
{	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}

function numberformat(n,DECIMAL_POINT,THOUSANDS_SEP)
{	n += '';
	x = n.split('.');
	x1 = x[0];
	x2 = x.length > 1 ? DECIMAL_POINT + x[1] : '';
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(x1)) {
		x1 = x1.replace(rgx, '$1' + THOUSANDS_SEP + '$2');
	}
	return x1 + x2;
}