function house_errors() {
    return (trim(document.forms[0].house_number.value) == "" && trim(document.forms[0].flat_number.value) == "" && trim(document.forms[0].house_name.value) == "");
}
function checkPostCode()
{
    postCodevalue = trim(document.forms[0].postcode.value);
    if (postCodevalue.length < 5 || postCodevalue.length > 8)

        return true;

    else

        return false;


}

function trim(s)
{
    var l = 0;
    var r = s.length - 1;
    while (l < s.length && s[l] == ' ')
    {
        l++;
    }
    while (r > l && s[r] == ' ')
    {
        r -= 1;
    }
    return s.substring(l, r + 1);
}