Dynamically hide/show SSRS Report Parameter

Hello,

I have 2 report parameters in SSRS - For eg, say EmpId and DeptId. The user could enter either EmpId or DeptId.
If they enter a value for EmpId, I want the next report parameter which is DeptId to be disabled.
Only when they do not enter anything for the EmpId, I want the DeptId report parameter to be enable for them to type an id into it.
I do not think there is a way to hide/show a report parameter dynamically.
But is there a workaround for this?

Thanks!