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How can I trigger an javascript event when I move the mouse over the child or sub child? Bcoz I want to display the long description at a textarea when user point to the over the menu child. Thanks!

The dhtmlxMenu doesn't provide public event for such purpose, but it has inner method which called onMouseOver and can be used for your purpose  

in dhtmlxProtobar.js you can locate next code

        dhtmlXButtonPrototypeObject.prototype._onmouseoverX=function(e){
            if (!e) e=event;
            custom_function(this.objectNode.text);
            if (this.timeoutop) clearTimeout(this.timeoutop);
            this.timeoutop=setTimeout( this.objectNode._delayedTimerCall(this.objectNode,"_onmouseoverY"),50);
        };

text marked bold - possible addition, the custom_function will be called on each mouseover event

Itwork~! Thank you!