//初期設定
var posX = 0; //現在の座標
var endX = 0; //スライド終了座標
var displayW = 130; //1画面分の幅
var speed = 10; //スライドの早さ
var timer;

//スライド開始用
function startmove(turn){
slideItem = document.getElementById("slideItems");
if(!timer){
if(turn == "right"){
if(posX <= (slideItem.offsetWidth-displayW)*-1){
endX = (slideItem.offsetWidth)*-1;
} else {
endX = posX-displayW;
}
} else { 
if(posX >= 0){
endX = 0;
} else {
endX = posX + displayW;
}
}

timer = setInterval("move()",1);
}
}

//スライド動作用
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";
}
}