function IsEmpty( text )
{
    if( text.value.length == 0 ) 
        return( true );
    for( var i=0; i<text.value.length; ++i )  
    {
        var ch = text.value.charAt(i);
        if( ch != ' ' && ch != '\t' ) 
            return( false );
    }
    return( true );
}


function IsEmail( text )
{
    if( text.value.length == 0 ) 
        return( false );
    if( text.value.indexOf("@") == -1 || text.value.indexOf(".") == -1 )
        return( false );
    return( true );
}


function ValidateDonationForm(F)
{
    if ( IsEmpty(F.fullName) )
        {
        alert("Please enter your name.");
        F.fullName.focus();
        }
    else 
	if ( IsEmpty(F.email) || !IsEmail(F.email) )
        {
        alert("Please enter a valid e-mail address.");
        F.email.focus();
        }
    else
    if ( IsEmpty(F.futureDonation) )
        {
        alert("Please enter the amount you would like to donate.");
        F.futureDonation.focus();
        }
    else  
    return( true );
    
    return( false );
}