function isBlank( s )
{
    var pos;

    for( pos = 0; pos < s.length; pos++ )
        if( s.charAt(pos) > ' ' ) return false;

    return true;
}

function isNumber( s )
{
    var pos;

    if( s.length == 0 ) return false;

    for( pos = 0; pos < s.length; pos++ )
        if( s.charAt(pos) < '0' || s.charAt(pos) > '9' ) return false;

    return true;
}

function isAlphaNum( s )
{
    var pos;

    for( pos = 0; pos < s.length; pos++ )
    {
        if( s.charAt(pos) >= '0' && s.charAt(pos) <= '9' ) continue;
        if( s.charAt(pos) >= 'A' && s.charAt(pos) <= 'Z' ) continue;
        if( s.charAt(pos) >= 'a' && s.charAt(pos) <= 'z' ) continue;
        if( s.charAt(pos) == '_' ) continue;
        return false;
    }
    return( pos != 0 ? true : false );
}

function isPhone( phoneStr )
{
    var pos;

    if( phoneStr.length < 7 || phoneStr.length > 8 ) return false;

    for( pos = 0; pos < 3; pos++ )
        if( phoneStr.charAt(pos) < '0' || phoneStr.charAt(pos) > '9' )
            return false;

    if( phoneStr.length == 8 )
    {
        if( phoneStr.charAt(pos) != '-' && phoneStr.charAt(pos) != ' ' )
            return false;
        pos++;
    }
    for( ; pos < phoneStr.length; pos++ )
        if( phoneStr.charAt(pos) < '0' || phoneStr.charAt(pos) > '9' )
            return false;

    return true;
}

function isEmail( emailStr )
{
    var emailPat=/^(.+)@(.+)$/
    var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
    var validChars="\[^\\s" + specialChars + "\]"
    var quotedUser="(\"[^\"]*\")"
    var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
    var atom=validChars + '+'
    var word="(" + atom + "|" + quotedUser + ")"
    var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
    var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
    var matchArray=emailStr.match(emailPat)

    if (matchArray==null) return false

    var user=matchArray[1]
    var domain=matchArray[2]

    if (user.match(userPat)==null) return false

    var IPArray=domain.match(ipDomainPat)

    if (IPArray!=null)
    {
        for (var i=1;i<=4;i++)
            if (IPArray[i]>255) return false

        return true
    }
    // Domain is symbolic name
    var domainArray=domain.match(domainPat)

    if (domainArray==null) return false

    var atomPat=new RegExp(atom,"g")
    var domArr=domain.match(atomPat)
    var len=domArr.length

    if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3)
        return false

    if (len<2) return false

    return true;
}

function hasAlpha( s )
{
    var pos;

    for( pos = 0; pos < s.length; pos++ )
    {
        if( s.charAt(pos) >= 'A' && s.charAt(pos) <= 'Z' ) return true;
        if( s.charAt(pos) >= 'a' && s.charAt(pos) <= 'z' ) return true;
    }
    return false;
}

function hasNumber( s )
{
    var pos;

    for( pos = 0; pos < s.length; pos++ )
    {
        if( s.charAt(pos) >= '0' && s.charAt(pos) <= '9' ) return true;
    }
    return false;
}

function hasAlphaNum( s )
{
    var pos;

    for( pos = 0; pos < s.length; pos++ )
    {
        if( s.charAt(pos) >= '0' && s.charAt(pos) <= '9' ) return true;
        if( s.charAt(pos) >= 'A' && s.charAt(pos) <= 'Z' ) return true;
        if( s.charAt(pos) >= 'a' && s.charAt(pos) <= 'z' ) return true;
    }
    return false;
}