When we use getelementbyid in JS the browser ask to allow or block the script, is there a piece of script to automatically allow that or avoid that or is there an alternative for that
If "the browser" is IE and you are viewing the file locally, this is because IE blocks JavaScript by default in local HTML as a security measure.
If "the browser" is Firefox (very unlikely), this is because netscape.security.PrivilegeManager.enablePrivilege
was called. Never call that function.