I am trtying to create a workflow that updates a date field when the prior value is a Queue ID (Owner ID) and is changed. 

i have been able to do it when there is a picklist value like this

ISPICKVAL(PRIORVALUE(  Queue__c ), "QC Review")&& ischanged ( Queue__c )

How do I write the below referencing a lookup owner filed rather then a picklist field

PRIORVALUE(ownerid =  "00G37000000heZl") && ischanged ( ownerid)

Thanks in advanced

Sean