var posX=0;  
var endX=0;   
var displayW=480;  
var speed=9;  
var timer;


function startmove(turn){
  slideItem=document.getElementById("slideItems");
  if(!timer){
  if(turn=="right"){
    if(posX<=(slideItem.offsetWidth-displayW)*-1){
      endX=(slideItem.offsetWidth-displayW)*-1;
    }else{
      endX=posX-displayW;
    }
  }else{
    if(posX>=0){
      endX=0;
    }else{
      endX=posX+displayW;
    }
  }
  timer=setInterval("move()",1);
  }
}

function move(){
  posX+=(endX-posX)/speed;
  if(Math.abs(endX-posX)<=1){
  document.getElementById("slideItems").
  style.left=endX+"px";
  posX=endX;
  clearInterval(timer);
  timer=undefined;
  }else{
  document.getElementById("slideItems").
  style.left=posX+"px";
  }
}