javascript tab 左右移动

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<script language="javascript"> 
var speed=10;
var step=10;
var timer;
function leftAdd(){
    timer=setInterval(function(){solutionTabs.scrollLeft+=step;},speed);
}
function leftReduce(){
    timer=setInterval(function(){solutionTabs.scrollLeft-=step;},speed);
}
function stopTimer(){
    clearInterval(timer);
}
</script>
         
         <div class="right_pro_qiehuan_anniu2" id="right"><img src="/images/arrow_state_grey_right.png" onmousedown="leftAdd();" onmouseup="stopTimer();" style="cursor:pointer;border:0px;"/></div>
      </div>
         
        <div class="plan_left_content">
         <div class="plan_left_content_left_img">