if u r in some project then it will create some problem in the sense that u have to get the approval from ur reporting manager(in some cases NOC from client also)
Simply write a mail to ur PM cc it to HR stating that consider this mail as ur official resignation and ur last date in the organisation is ***
now notice period is 30 days so if u dont serve the 30 days notice period u have to shell out money as equivalent to the salary for those number of days which u r not serving.. lets say u r giving notice for only 20 days then u have to give money for remaining 10 days only...
and dont worry(this process is very smooth once ur PM approves it from his end)....
CHEERS