don't understand... "The RED box is to spot the problem..." u mean that u drew the box, right? do you mean that when u click on the link, nothing happens except for the green circle appearing?
provide the link and we'll check...
if i understand correctly, the green is just a mouseover action. you might have a problem because of the html coding for that page/site that is not compartible with mac ox explorer. It could also be a java issue, there is sun java and microsoft own java, you can try using sun java.