Loading an external swf problem

Sorry guys I need yet more help! I have 3 drop menus on one scene and they all work fine, but I want one of the buttons within one of the drop menus to load an external swf. I’ve followed a tutorial but nothing happens. This is the action script i’ve used for the button:
on(rollover) {
} [color=red](for the drop menu to work)[/color]
on (release) {
I’ve added an empty movie clip with an instance name ‘content’, I can’t understand why its not loading the swf. Any help would be great! Ta muchly.