[JS] [CS5] Possible to change "Paragraph Spacing Limit" with a Script

Question

Hi,
right now I'm writing a simple script which formats some text. For this formatting I need the vertical Justification "Justify" with a "Paragraph Spacing Limit" but I can't find something helpful.
Does anyone know how to set the limit to a specific value?
Thanks in advance, Statixx
Here's my not yet finished Script
Edit: script edited, had a few major mistakes
#target InDesign
var myDocument = app.activeDocument;
var mySelection = myDocument.selection[0];
var myParagraphLength = app.selection[0].paragraphs.length;
var myParagraph = app.selection[0].paragraphs;
var myTest
mySelection.visibleBounds = [0,0,30,90];
mySelection.textFramePreferences.insetSpacing = [3,3,1.5,3];
mySelection.textFramePreferences.verticalJustification = VerticalJustification.JUSTIFY_ALIGN;
if ( myParagraphLength == 3) {
       var myPara0 = myParagraph[0].contents;
       var myPara1 = myParagraph[1].contents;
       var myPara2 = myParagraph[2].contents;
        myParagraph[0].pointSize = "13pt";
        myParagraph[0].leading = "13pt";
        myParagraph[0]. fontStyle= "Bold";
        myParagraph[1].pointSize = "10pt";
        myParagraph[1].leading = "10pt";
        myParagraph[1].leftIndent= "10";
        myParagraph[2].pointSize = "10pt";
        myParagraph[2].leading = "10pt";
        myParagraph[2].fontStyle= "Bold";
        myParagraph[2].leftIndent= "10";

Answer 1

Hi,
That is a textFramePreferences property
mySelection.textFramePreferences.verticalThreshold = Number (range 0- 8640)
ID Object Reference says:
"...The maximum amount of vertical space between two paragraphs. Note: Valid only when vertical justification is justified; the specified amount is applied in addition to the space before or space after values defined for the paragraph..."