Can I disable delete (file or folder) functionality on browse_Media, browse_Img pages?

Just modify the security file.

 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 <security name="MaxImageSize">1000</security>
 <security name="MaxMediaSize">100000</security>
 <security name="MaxFlashSize">100</security>
 <security name="MaxDocumentSize">1000</security>
 <security name="MaxTemplateSize">1000</security>
 <security name="ImageGalleryPath">/uploads</security>
 <security name="MediaGalleryPath">/uploads</security>
 <security name="FlashGalleryPath">/uploads</security>
 <security name="TemplateGalleryPath">/uploads</security>
 <security name="FilesGalleryPath">/uploads</security>
 <security name="AllowUpload">true</security>
 <security name="AllowCreateFolder">true</security>
 <security name="AllowRename">true</security>
 <security name="AllowDelete">true</security>
 <security name="ImageFilters">
  <item>.jpg</item>
  <item>.jpeg</item>
  <item>.gif</item>
  <item>.png</item>
 </security>
 <security name="MediaFilters">
  <item>.avi</item>
  <item>.mpg</item>
  <item>.mpeg</item>
  <item>.mp3</item>
  <item>.wav</item>
 </security>
 <security name="DocumentFilters">
  <item>.txt</item>
  <item>.doc</item>
  <item>.pdf</item>
  <item>.zip</item>
  <item>.rar</item>
  <item>.avi</item>
  <item>.mpg</item>
  <item>.mpeg</item>
  <item>.htm</item>
  <item>.jpg</item>
  <item>.jpeg</item>
  <item>.gif</item>
  <item>.png</item>
  <item>.mp3</item>
  <item>.wav</item>
 </security>
</configuration>