[SWFObject] escape character into script javascript attached to swfObject

[design]

I don't how to use properly the characters like :ä, ü, é, ' into my
javascript script attached to my swfObejct.
e.g.:
so.addVariable("str_installingtext", "Bitte+warten+Sie%2C+w%E4hrend+die
+Applikation+heruntergeladen+wird.");

I should be able to see:
Bitte warten während die Application heruntergeladen wird.



<script type="text/javascript" charset="ISO-8859-1">

                // <![CDATA[
                // version 9.0.115 or greater is required for launching AIR 
apps.

                        var so = new SWFObject("AIRInstallBadge.swf", "", 
"215", "180",
"9.0.115", "#000000");

                so.addVariable("airversion", "1.5.3.9130");

                so.addVariable("appname", "LeShop.Widget");

                so.addVariable("appurl", "http:/....air");

                so.addVariable("image", "http://....jpg";);

                so.addVariable("appid", "LeShopWidget");

                so.addVariable("appversion", "v1.1");

                so.addVariable("hidehelp", "true");

                so.addVariable("str_error", "Ein%20Fehler%20ist%20aufgetreten");

                so.addVariable("str_err_params", 
"Die+Installierungs-Parameter+sind
+ung%FCltig.");

                so.addVariable("str_err_airunavailable", 
"Adobe%20AIR%E2%84%A2%20ist
%20nicht%20kompatibel%20mit%20Ihrem%20Betriebssystem.");

                so.addVariable("str_err_airswf", "Adobe%20AIR%E2%84%A2%20konnte
%20nicht%20heruntergeladen%20werden.");

                so.addVariable("str_loading", "Wird%20geladen%E2%80%A6");

                so.addVariable("str_install", "Jetzt%20herunterladen");

                so.addVariable("str_launch", "Starten");

                so.addVariable("str_upgrade", "Jetzt%20aktualisieren");

                so.addVariable("str_close", "Schliessen");

                so.addVariable("str_tryagain", "Erneut%20versuchen");

                so.addVariable("str_launching", "Start%20der%20Applikation");

                so.addVariable("str_launchingtext", 
"Bitte+warten+Sie%2C+w%E4hrend
+die+Applikation+gestartet+wird.");

                so.addVariable("str_installing", "Herunterladen");

                so.addVariable("str_installingtext", 
"Bitte+warten+Sie%2C+w%E4hrend
+die+Applikation+heruntergeladen+wird.");

                so.write("flashcontent");

                // ]]>
        </script>

thank's for you help

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