String concatination in Activ Script

I would like to format the text returned in a MESSAGEBOX; simple things like a blank line between two statements.

For example, some languages allow the following:

MESSAGEBOX('String 1' + chr(13) + chr(13) + 'String  2'), which yields two lines of text separated by a blank line.

How might this be done in ActivScript?

<script>
window.external.ActivSet( 'nothing', ' ' ) ;
</SCRIPT>

MESSAGEBOX('{String1}{nothing}{String2}')

-----------------

There are a number of formats that are allowed for string expressions:

Single Quotes

If you enclose a string in single quotes, then Activ Variables within the string, that are enclosed in curly braces ({}), will be expanded into their values.

For example, the following statement, will display the title of the E-Book in a message box:

MESSAGEBOX('{title}')

Note: The string may contain multiple Activ Variables, and may also contain other text, so the following is also perfectly valid:

MESSAGEBOX('The title of this E-Book is {doublequote}{title}{doublequote}')

Non Expanding Quotes

If you enclose a string in single quotes, preceded by a tilde character (~), then Activ Variables are not expanded.

For example, the following statement, will actually display {title} in a message box:

MESSAGEBOX(~'{title}')

Numerical Expressions

It is actually possible to use a numerical expression in places where a string expression would be required. The numerical expression will be evaluated, and the result value converted into a string.

For example, the following statement, will display the number 4 (the result of evaluating 2+2 as a numerical expression and converting the result value to a string), in a message box:

MESSAGEBOX(2+2)

In contrast, the following statement will actually display 2+2 in a message box:

----------

SCRIPT
var getit = ('String 1' + chr(13) + chr(13) + 'String  2'),
window.external.ActivSet( 'showit', getit ) ;
/SCRIPT

MESSAGEBOX('{showit}')

------------

Some programming languages will use  |   for a line break.

<.SCRIPT>
var getit="String 1" + "\r" + "\r" + "String 2" ;
window.external.ActivSet( 'showit', getit ) ;
<./SCRIPT>
<.A HREF="##MESSAGEBOX('{showit}')">Click Here<./A>

<.SCRIPT>
var getit="String 1" + "\r" + "\r" + "String 2" ;
alert(getit);
<./SCRIPT>