get value send by one model

I have two models: employee and taskassign.
In employee I have a link "task assign" in which I pass $employee
['Employee']['id'] to the taskassigns/add..
and in "add function" of tasks_controller we should get the value of
$employee['Employee']['id'].and this value should be passed to the
foreign key employee_id of task_assigns..how can I attain that..I'm a
newbie in cakephp..plz help me
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