Hiding of Owner field froma crm form

We needed to hide the ownerid from a crm form. we tried using crmForm.all.ownerid.style.display ="none";

This was partially working as the fields look up button was hidden, but didn't hide the entire field.

Then we used
crmForm.all.ownerid_d.style.display ="none"; and it worked.

Also when tried to hide a tab we had to wait till it gets rendered and then take the id of the tab.