connection between two s-objects(without relationship)

[ravi1234]

i have 2 s-objects student and financialstatements.

in student sobject a field called amount 

in financialstatements sobject a filed called revenue

so my requirement is ::::

   when i enter a value in amout field it as to update revenue field.....

how can i achieve this

NOTE::::::::  THERE IS NO RELATIONSHIP BETWEEN 2 SOBJECTS 

[ravi1234]

can u pls send me code for this.......

   iam  new to the salesforce.....

  thaks for giving reply

[hari somaplli]

trigger studenttrg on Student__c (Before insert,Before update){
student__c st=Trigger.new[0];
fs__c f=new fs__c();
f.revenue__c=st.amount__C;
insert f;

}