Export PDF

Hello everyone,

I'm posting here because I really can't find a solution to my problem.
I have a 4 page indesign file and I would like to export from this document 4 pdf :

1 pdf with pages 1 and 3 in small definition
1 pdf with pages 1 and 3 in high definition
1 pdf with pages 2 and 4 in small definition
1 pdf with pages 2 and 4 in high definition

I have a script to save my document in several pdf's of different qualities, but I can't integrate a code to select that certain page. I have tried with colour labels but without success.

Here is the script I use to export my pdfs of different qualities.

d = app.activeDocument; 
// Here you can choose the PDF preset 
preset1 = app.pdfExportPresets.itemByName("Print");
preset2 = app.pdfExportPresets.itemByName("Web"); 

if (!(preset1.isValid && preset2.isValid)){ 
 alert("One of the presets does not exist. Please check spelling carefully."); 
 exit(); 
} 
if (d.saved){ 
 thePath = String(d.fullName).replace(/\..+$/, "") + ".pdf"; 
 thePath = String(new File(thePath).saveDlg()); 
} 
else{ 
 thePath = String((new File).saveDlg()); 
} 
thePath = thePath.replace(/\.pdf$/, ""); 
name1 = thePath+"_print.pdf"; 
name2 = thePath+"_web.pdf";  
d.exportFile(ExportFormat.PDF_TYPE, new File(name1), false, preset1); 
d.exportFile(ExportFormat.PDF_TYPE, new File(name2), false, preset2);

Thank you very much,

Claire