HitTest on mc doesn't work with scrollRect!

1

I have two pieces of code, that won’t work together…

First: this makes a hitTest on an mc to make it run on rollover:

 onClipEvent (enterFrame) {
 if (this.hitTest(_root._xmouse, _root._ymouse, true)) {
  if (this._currentframe<this._totalframes) {
   nextFrame();
  }
 } else {
  if (this._currentframe>1) {
   prevFrame();
  }
 }
}

This works - until I put the next part of code inside to make the parent mc scroll:

 web_slide.scrollRect={x:0,y:0,width:250,height:104}
btn_up.onRelease = function () {
 if (web_slide.scrollRect.y = web_slide.scrollRect.y ) {
  
 var newpos=web_slide.scrollRect
 newpos.y-=53
 web_slide.scrollRect=newpos }}
btn_down.onRelease = function () {
 if (web_slide.scrollRect.y = web_slide.scrollRect.y - 106 ) {
  
 var newpos=web_slide.scrollRect
 newpos.y+=53
 web_slide.scrollRect=newpos }}

Each work seperately, but they won’t together. How do I get around this?