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//I attach to the stage two instances of a clip called pano, which contains all my thumbnails

_root.attachMovie("pano","pano1",1)
_root.attachMovie("pano","pano2",2)

//I have two clips on stage called mask1 and mask2 which will mask
//the clips pano1 and pano2. I couldn't find a way to use one mask for two clips, so I used two masks

half=mask1._width/2
speedreducer=50
stagewidth=1020
deceleration=0.9
pano1._x=0
pano2._x=pano1._x+pano1._width
pano1._y=pano2._y=_root.mask1._y



_root.pano1.setMask(mask1)
_root.pano2.setMask(mask2)

//after realizing that "onRollOver" function doesn't work for my purposes (because it blocked all other rollOver actions on the thumbnails)
// I decided to use hitTest, which is more practical, in my opinion. 

_root.onEnterFrame=function(){
    if (mask1.hitTest( _root._xmouse, _root._ymouse, false)){
        
        
        posmouse=_xmouse-half
        posactual=pano1._x

// the trouble was here: unless I use the "Math.round" method, the clips would move inconsistently

        pano1._x-=Math.round(posmouse/speedreducer)
        pano2._x-=Math.round(posmouse/speedreducer)
        posnew=pano1._x
        vel=Math.abs(posnew-posactual)
        
    
        if(posmouse<0){ 
            if(pano1._x>stagewidth){
                pano1._x=pano2._x-pano2._width
                
            }
            if(pano2._x>stagewidth){
                pano2._x=pano1._x-pano1._width
            }
        }
        else if(posmouse>0){    
            if(pano1._x<0){
                pano2._x=pano1._x+pano1._width
            }
            if(pano2._x<0){
                pano1._x=pano2._x+pano2._width
            }
        }

    }
    //If the mouse is outside the masks area and the clips are still moving, they will decelerate little by little
    else {
        if(vel>0){
            posmouse=_xmouse-half
    
            if(posmouse<0){ 
                    pano1._x+=vel
                    pano2._x+=vel
                
                if(pano1._x>stagewidth){
                    pano1._x=pano2._x-pano2._width
                    
                
                }
                if(pano2._x>stagewidth){
                pano2._x=pano1._x-pano1._width
                
                }
        }
            else if(posmouse>0){
                pano1._x-=vel
                    pano2._x-=vel
                if(pano1._x<0){
                    pano2._x=pano1._x+pano1._width
                }
                if(pano2._x<0){
                    pano1._x=pano2._x+pano2._width
                }
            }
            vel-=deceleration
        }
            
    }
}