Hide Section in Tab on CRM 4.0 form 

crmForm.all..parentElement.parentElement.parentElement.style.display="none";
//Another way from top down:
document.getElementById("tab").childNodes[0].rows[].style.display = "none";
//  is zero based tab number from left.  is zero based section number from top.
//To show it back, simply replace "none" with "block".
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