I need help with this?

I’m trying to create a simple flash layout (http://onlinewebhelp.org/layout) but I came across 2 problems with this, one is when I hover my mouse pointer over any button it flickers or starts shaking. It works fine if I move my mouse over text but creates problem when I move from left or right. this is how I’ve done buttons ([URL=“http://onlinewebhelp.org/layout/flicker.gif”]http://onlinewebhelp.org/layout/flicker.gif) and the code for each button is


b2_mc.onRollOver = function() {
    
        this.gotoAndPlay("over");
}

b2_mc.onRollOut = function() {
    
        this.gotoAndPlay("out");
}

Second is since I’ve just started learning Flash so I dunno how can I get variables values from FORM . I wanted to tween form so I selected everthing on form and converted it into movie clip form_mc and instance name form_ins.
which is the right way _root.form_mc.txt_name or _root.form_ins.txt_name (where txt_name is an instance name of name text box) . please help

thanks in advance.