parentPage is not working in CS4

Hi,

I am using the below script to clear paste board and getting the details what I cleared. But It is not working in CS4. It throw error in line 21, with parenPage is not supporting.

I tried instance of Spread but no use.

Original Thread: Re: Pasteboard items information

Could you please help to solve this?

var scriptName = "Delete objects on pasteboard",    
doc;    
    
PreCheck();    
    
function Main() {    
    var obj, howManyImages,    
    objs = doc.pageItems.everyItem().getElements(),   
    countTotal = countTextFrame = countRectangle = countImage = 0;    
    var lnkname=[];  
      
     var layers=doc.layers;  
    for(var i=0;i<layers.length;i++){  
    if (layers.locked){  
       layers.locked=false;  
     }  
   }  
      
    var links = doc.links;    
    for(var j = 0; j < links.length; j++){    
    if(links.parent.parent.parentPage == null){  
        lnkname.push(links.name);  
    }  
    }    
  
  
        
    for (var i = objs.length - 1; i >= 0; i--) {    
        obj = objs;    
        //lnkname.push(doc.allGraphics.itemLink.name);  
  
  
//var doc = app.activeDocument;  
       if(obj.parentPage == null) {    
            if (obj.locked) {    
                obj.locked = false;    
            }    
            
            try {    
                howManyImages = obj.allGraphics.length;                                    
                obj.remove();    
                countTotal++;    
                countImage += howManyImages;  
  
  
            if (obj instanceof TextFrame) {    
                    countTextFrame++;    
                }     
                
                if (obj instanceof Rectangle) {    
                    countRectangle++;    
                }    
            }    
            catch(err) {    
                $.writeln(err.message + ", line: " + err.line);    
            }    
        }    
    }    
    
    var report = (countTotal == 0) ? "Nothing has been removed." :    
                        "In total " + countTotal + " object" + ((countTotal == 1) ? " was" : "s were") + " removed.\nIncluding:\n\n" +     
                        countTextFrame + " Text Frame" + ((countTextFrame == 1) ? "" : "s") + "\n" +     
                        Number(countRectangle-countImage) + " Rectangle" + ((countRectangle == 1) ? "" : "s") + "\n" +     
                        countImage + " Image" + ((countImage == 1) ? "" : "s" + "\nImage Name - \n"+lnkname.join("\n"));    
    
    alert(report, scriptName);    
}    
    
function PreCheck() {    
    if (app.documents.length == 0) ErrorExit("Please open a document and try again.", true);    
    doc = app.activeDocument;    
    if (doc.converted) ErrorExit("The current document has been modified by being converted from older version of InDesign. Please save the document and try again.", true);    
    if (!doc.saved) ErrorExit("The current document has not been saved since it was created. Please save the document and try again.", true);    
    Main();    
}    
    
function ErrorExit(error, icon) {    
    alert(error, scriptName, icon);    
    exit();    
} 

Regards,

K