nsICSSRule* rule = (nsICSSRule*)aRule;
CloneRuleInto(nsISupports* aRule, void* aArray){  nsICSSRule* rule = (nsICSSRule*)aRule;  nsICSSRule* clone = nsnull;  rule->Clone(clone);  if (clone) {    nsISupportsArray* array = (nsISupportsArray*)aArray;    array->AppendElement(clone);    NS_RELEASE(clone);  }  return PR_TRUE;}