//-------------------------------------------------------------------------------

var _txtPostcode;

function Initialise(txtPostcode)
{
    _txtPostcode = document.getElementById(txtPostcode);
}

function CheckForm()
{
    if (isBlank(_txtPostcode.value))
    {
        alert("Please enter postcode.");
        _txtPostcode.focus();
        _txtPostcode.select();
        return false;
    }
    return true;
}