Something like this should work:
Please correct me if something should be done otherwise.
nsCOMPtr<nsIDOMNode> pINode = // Initialize
from wherever. We
assume you have this pointer here
nsCOMPtr<nsIDOMDocument> pIDOMDocument;
pINode->GetOwnerDocument( getter_AddRefs( pIDOMDocument ) );
nsCOMPtr<nsIDOMDocumentEvent> pDOMDocEvent
( do_QueryInterface( pIDOMDocument ) );
nsCOMPtr<nsIDOMEvent> pEvent;
rv = pDOMDocEvent->CreateEvent(NS_LITERAL_STRING("mouseevent"),
getter_AddRefs( pEvent ) );
nsCOMPtr<nsIDOMMouseEvent> pMouseEvent
( do_QueryInterface( pEvent ) );
PRBool bRetval ;
pMouseEvent->InitMouseEvent(NS_LITERAL_STRING("mouseover"), PR_TRUE,
PR_FALSE, nsnull, 1, 0, 0, 0, 0, PR_FALSE, PR_FALSE, PR_FALSE,
PR_FALSE, 0, 0 );
pEventTgt->DispatchEvent( pMouseEvent, &bRetval );
pMouseEvent->InitMouseEvent(NS_LITERAL_STRING("click"), PR_TRUE,
PR_FALSE, nsnull, 1, 0, 0, 0, 0, PR_FALSE, PR_FALSE, PR_FALSE,
PR_FALSE, 0, 0 );
pEventTgt->DispatchEvent( pMouseEvent, &bRetval );
pMouseEvent->InitMouseEvent(NS_LITERAL_STRING("mouseout"), PR_TRUE,
PR_FALSE, nsnull, 1, 0, 0, 0, 0, PR_FALSE, PR_FALSE, PR_FALSE,
PR_FALSE, 0, 0 );
pEventTgt->DispatchEvent( pMouseEvent, &bRetval );
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