Help with AS3 Button Animation

I was wondering if someone could please help me with some actionscript…
I have a button that has a movie clip in both “down” and “over”. Basically I want an animation to play when I hover over my button and a second animation to play when I click it, then I want to open an HTML page within the same window.
Everything works fine except when I click the button, the animation doesn’t show up it just goes straight to the HTML page. How do I make it so that the entire “down” animation plays before going to the HTML page?

Thank you!