Auto Refresh specific tab in browser and specific area of Page by Javascript

I had one requirement to auto refresh any page after specif interval and that should show only that part of the page which content I want to see.

Below is the Java script code which has to be added as a bookmark and click that bookmark after opening the page and scroll down to specific part you want to see after each refresh.



javascript:
refresh_interval=prompt("Set Refresh Interval in Seconds [s]");
current_page=location.href;
if(refresh_interval>0) {
  selectedFrame='<frameset cols=\'*\'>\n<frame id="refreshframe" src=\''+current_page+'\'/>';
  selectedFrame+='</frameset>';
  with(document) {
    write(selectedFrame);
    void(close())
  };
  setTimeout('reload()',1000*refresh_interval);
} else {
  location.replace(current_page);
}
function reload() {
  setTimeout('reload()',1000*refresh_interval);
  var frameToSet = document.getElementById('refreshframe');
  frameToSet.contentWindow.location.reload(false);
}