RewriteEngine on
RewriteCond %{HTTP_HOST} ^cleartrip.creditexa.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.cleartrip.creditexa.com$
RewriteRule ^/?$ "http\:\/\/trackin\.affiliserve\.com\/\?PID\=5855\&AID\=89840\&CID\=2998948\&MID\=40345\&WID\=24513\&UID\=nita" [R=301,L]