animate scripting in new unity 2d toolkit

hi guys , i did it with changing the offset of material in older versions of unity , but now it seems that somethings have been changed...new 2d toolkit... and im ready to change too ..! so would anyone tell me plz that how can i code the sprite parts for animating , for example if the player pressed the right arrow some frames play , and if ...... ofcourse ive seen some videos in youtube but none of them tell anything about scripting the frame selection , so ..... this was my code for changing the material offset...

 function aniSprite (columnSize, rowSize, colFrameStart, rowFrameStart, totalFrames, framesPerSecond)// function for animating sprites
 {
     var index : int = Time.time * framesPerSecond;                                                    // time control fps
     index = index % totalFrames;                                                                    // modulate to total number of frames
     
     var size = Vector2 (1.0 / columnSize, 1.0 / rowSize);                                            // scale for column and row size
     
     var u = index % columnSize;                                                                        // u gets current x coordinate from column size
     var v = index / columnSize;                                                                        // v gets current y coordinate by dividing by column size
     
     var offset = Vector2 ((u + colFrameStart) * size.x,(1.0 - size.y) - (v + rowFrameStart) * size.y); // offset equals column and row
     
     renderer.material.mainTextureOffset = offset;                                                    // texture offset for diffuse map
     renderer.material.mainTextureScale  = size;                                                        // texture scale  for diffuse map
     
     //renderer.material.SetTextureOffset ("_BumpMap", offset);                                        // texture offset for bump (normal map)
 //renderer.material.SetTextureScale  ("_BumpMap", size);                                            // texture scale  for bump (normal map) 
 }

thanx and more