http://www.indd-skript.de/idshelper/symbols/idsTools.html 

#include "idsHelper.jsx" 

http://www.indd-skript.de/idshelper/symbols/src/src_main_js_idsHelper.jsx.html 

<root> 
<Name> 
<Vorname>Ingolf</Vorname> 
<Nachname>Ameise</Nachname>  
</Name> 
<Name> 
<Vorname>Ingrid</Vorname> 
<Nachname>Ämeise</Nachname>  
</Name> 
<Name> 
<Vorname>Frieda</Vorname> 
<Nachname>Zucker</Nachname>  
</Name> 
</root> 

String.prototype.padRight = function(fillc, length) 
{if (this.length<length){return (this+fillc.fill(length-this.length)).substr(-length);}return this;} 
String.prototype.left=function(length){if (this.length<length) return this; return this.substr(0,length)}; 
 
main() 
 
function main() 
{ 
    var names = new Array(); 
    names.push({sortfield: "", preName: "Frieda", lastName: "Zucker"  }) 
    names.push({sortfield: "", preName: "Ingrid", lastName: "Ämeise"  }) 
    names.push({sortfield: "", preName: "Ingolf", lastName: "Ameise"  }) 
    var l = names.length; 
    for (var i = 0; i<l; i++) 
        names[i].sortfield = removeUmlaut(names[i].lastName).padRight(" ",30)+ removeUmlaut(names[i].preName).padRight(" ",30); 
    names = names.sort(sort); 
    return; 
    /*int*/function sort(e1, e2) 
    { 
       if (e1<e2) return 1; 
       if (e1>e2) return -1; 
       return 0;            
    } 
         
         
    // Gregor Fellenz : 
     /*string*/ function removeUmlaut (a) 
     { 
        a = a.toLowerCase(); 
        a = a.replace(/ä/g,"a"); 
        a = a.replace(/ö/g,"o"); 
        a = a.replace(/ü/g,"u"); 
        a = a.replace(/ß/g,"s");	 
        return a; 
     } 
 }