Make a script function as a single action rather than many

Question

Basically I have a loop that changes all the paragraph and character styles in a document for a particular language.
As such however, every time someone runs it, if you need to undo you have to hold down ctrl+z for a while. I'd rather if it ran a bit cleaner in this regard.
Here is the script, please let me know what I need to wrap it in in order to do this. Also, I'm running cs4, however I'd like it to be scalable for cs3 and cs5 as well, as currently it already does. All the best
/c
function arabic()
    var myStyles = app.activeDocument.allParagraphStyles;
    var myChStyles = app.activeDocument.allCharacterStyles;
//Paragraph Styles       
        for (oneStyle=1;oneStyle<myStyles.length;oneStyle++)
            myStyles[oneStyle].appliedLanguage= "Arabic";
            myStyles[oneStyle].ligatures= true;
            myStyles[oneStyle].hyphenation= true;
            myStyles[oneStyle].kerningMethod= "Metrics";
            myStyles[oneStyle].justification= 1919578996;
            myStyles[oneStyle].paragraphDirection= 1379028068;
            myStyles[oneStyle].paragraphJustification= 1886023265;
            myStyles[oneStyle].digitsType= 1684629609;
            myStyles[oneStyle].characterDirection= 1379028068;
            myStyles[oneStyle].composer= "Adobe World-Ready Paragraph Composer";
   //Pointsize, basic model
            var myPoint = myStyles[oneStyle].pointSize;
            myStyles[oneStyle].pointSize= myPoint + 3;
   //Leading, basic model
            var myLead = myStyles[oneStyle].leading;
            if (myStyles[oneStyle].leading == 1635019116){
                myStyles[oneStyle].leading = 1635019116;}
            else myStyles[oneStyle].leading = myLead + 3;
   //FONT CONDITIONALS
   //Garamond Pro
            if (myStyles[oneStyle].appliedFont.fontFamily== "Adobe Garamond Pro"){
                myStyles[oneStyle].appliedFont= "Traditional Arabic";
                if (myStyles[oneStyle].fontStyle== "Roman"){
                    myStyles[oneStyle].fontStyle= "Regular";}
                else if (myStyles[oneStyle].fontStyle== "Italic"){
                    myStyles[oneStyle].fontStyle= "Regular";
                    myStyles[oneStyle].skew= -15;}
                else if (myStyles[oneStyle].fontStyle== "Semibold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Semibold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";
                    myStyles[oneStyle].skew= -15;}
                else if (myStyles[oneStyle].fontStyle== "Bold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Bold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";
                    myStyles[oneStyle].skew= -15;}}
   //Minion Pro
            else if (myStyles[oneStyle].appliedFont.fontFamily== "Minion Pro"){
                myStyles[oneStyle].appliedFont= "Traditional Arabic";
                if (myStyles[oneStyle].fontStyle== "Regular"){
                    myStyles[oneStyle].fontStyle= "Regular";}
                else if (myStyles[oneStyle].fontStyle== "Italic"){
                    myStyles[oneStyle].fontStyle= "Regular";
                    myStyles[oneStyle].skew= -15;}
                else if (myStyles[oneStyle].fontStyle== "Semibold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Semibold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";
                    myStyles[oneStyle].skew= -15;}
                else if (myStyles[oneStyle].fontStyle== "Bold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Bold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";
                    myStyles[oneStyle].skew= -15;}}
   //Myriad Pro
            else if (myStyles[oneStyle].appliedFont.fontFamily== "Myriad Pro"){
                myStyles[oneStyle].appliedFont= "Yakout Linotype";
                if (myStyles[oneStyle].fontStyle== "Regular"){
                    myStyles[oneStyle].fontStyle= "Light";}
                else if (myStyles[oneStyle].fontStyle== "Italic"){
                    myStyles[oneStyle].fontStyle= "Light";
                    myStyles[oneStyle].skew= -15;}
                else if (myStyles[oneStyle].fontStyle== "Semibold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Semibold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Bold"){
                    myStyles[oneStyle].fontStyle= "Bold";}
                else if (myStyles[oneStyle].fontStyle== "Bold Italic"){
                    myStyles[oneStyle].fontStyle= "Bold";
                    myStyles[oneStyle].skew= -15;}}
//Character styles
        for (unStyle=1;unStyle<myChStyles.length;unStyle++)
            myChStyles[unStyle].appliedLanguage= "Arabic";
            if (myChStyles[unStyle].fontStyle== "Italic"){
                myChStyles[unStyle].fontStyle= NothingEnum.nothing;
                myChStyles[unStyle].skew= -15;}   
arabic();

Answer 1

Hey!
Change this:
arabic();
into this:
app.doScript(arabic, undefined, undefined, UndoModes.ENTIRE_SCRIPT, "Apply Arabic Langauge");
Hope that helps.
tomaxxi
http://indisnip.wordpress.com/