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 ValidateTicketRequestForm(F)

{

    if ( IsEmpty(F.firstName) )

        {

        alert("Please enter your first name.");

        F.firstName.focus();

        }

    else 

    if ( IsEmpty(F.lastName) )

        {

        alert("Please enter your last name.");

        F.lastName.focus();

        }

    else 

    if ( IsEmpty(F.email) || !IsEmail(F.email) )

        {

        alert("Please enter a valid e-mail address.");

        F.email.focus();

        }



    else 		 

   if ( IsEmpty(F.phone) )

        {

        alert("Please enter your phone number.");

        F.phone.focus();

        }

    else 

	 return( true );

    

    return( false );

}