Need help with 3D carousel gallery rotation to a specific angle

Hi,

I am making a 3d gallery, that has a menu underneath it. When clicking to a menu link, the gallery will rotate itself to a certain angle (photo) connected with the menu link. I am using FlashAndMaths 3D cylindrical gallery scripts (XML Customizable 3D Cylindrical Photo Gallery in Flash) as the base (as I couldn't find any free or neither payed 3d galleries that would have a menu connected to the carousel!).

The function to rotate a carousel of thumbnails is the following:

public function doRotate(ang:Number):void {                 if(isLoading || notReady){                           return;              }            if(!this.contains(container)){                return;            }            var i:int;             for(i=0;i<numCols;i++){               colsVec[i].rotationY+=ang;               colsVec[i].rotationY=colsVec[i].rotationY%360;               if((colsVec[i].rotationY>90+diffAng && colsVec[i].rotationY<270-diffAng) || (colsVec[i].rotationY<-(90+diffAng) && colsVec[i].rotationY>-(270-diffAng))){                      if(container.contains(colsVec[i])){                          container.removeChild(colsVec[i]);                      }                     } else {                                  if(!container.contains(colsVec[i])){                                 container.addChild(colsVec[i]);                               }                             }             }        }

This will rotate the carousel as an infinite loop. However - I need the function to stop at a certain angle e.g. 45% (and/or reset itself to 0%). Another option would be to stop the carousel at a certain thumbnail container.

The function to create a carousel is here:

thumbWidth=thumbsArray[0][0].width;
thumbHeight=thumbsArray[0][0].height;
colsVec=new Vector.<Column>();
colHeight=thumbHeight*colLen+(colLen-1)*pxSpace;
colWidth=thumbWidth;
rad=galLoader.radius;
angle=360/numCols;
container=new Sprite();
this.addChild(container);
containerWidth=2*rad;
vertAddOn=40;
vertDrop=15;
containerHeight=colHeight+vertAddOn;
container.x=containerWidth/2;
container.y=containerHeight/2+vertDrop;
contMask=new Shape();
this.addChild(contMask);
contMask.x=container.x;
contMask.y=container.y;
prepContainer();
diffAng=Math.round((Math.asin(rad/fL)*180/Math.PI)*1000)/1000; 
for(i=0;i<numCols;i++){
colsVec[i]= new Column(thumbsArray[i],pxSpace,rad);
container.addChild(colsVec[i]);
colsVec[i].y=0;
colsVec[i].x=0; 
colsVec[i].z=0;
colsVec[i].rotationY=angle*i;
if((colsVec[i].rotationY>90+diffAng && colsVec[i].rotationY<270-diffAng) || (colsVec[i].rotationY<-(90+diffAng) && colsVec[i].rotationY>-(270-diffAng))){
if(container.contains(colsVec[i])){
container.removeChild(colsVec[i]);
}
} else {
if(!container.contains(colsVec[i])){
container.addChild(colsVec[i]);
} } }

Could anyone help me as I'm out of ideas!