Help with Creating a Task and assigning a Lead.

Help with Creating a Task and assigning a Lead.

Thank you in advance for the help.  I am fairly new to Creator and have hit a road block.
I have been able to create a form, and submit appropriate Account & Contact info using:
  1. taskinfo = {
  2. "Owner":Task_Owner,
  3. "Subject":input.lnSubject,
  4. "Description":input.mtlnTaskDescription,
  5. "Status":"Open",
  6. "Task_Type" : input.drpTask_Type,
  7. "Who_Id" : input.crmAccountContactName,
  8. "Due_Date" : input.dateDueDate};
  9. task = zoho.crm.createRecord("Tasks",taskinfo);
Task_Owner is a VAR I defined due to a different issue... not important at the moment.
When trying to push a "Lead" instead of a "Contact", I cannot seem to make the Task create properly. I don't know if "Who_Id" is the correct variable for this.  I have tried Lead_id, Id, and many many other things.
The question is.. how on earth do I pass a Lead to a Task creation instead of a Contact.  FYI, I do collect the proper "Lead ID" in my form and can display that out in my Description for testing purposes, so I know I'm at least getting the correct Lead ID.

Thanks!