When coding in javascript, some people may wonder how to pass extra parameters to the event handler function. Here is a workaround hope can help you:
blow the example is coded using prototype
$(el).observe(’click’, function(e){ EVENT_HANDLER_FUNCTION(e, para1, para2, …)})
I guess the example code is quite self-explaining, hope can help =)

I discovered recently that it causes headache when using mouseover and mouseout events together on one HTML element. This will not have any problem if that element does not have any child element, otherwise,  the problem starts. My problem occurred when I tried to use special effects when mouseover and mouseout of an element which [...]