function sw(){
var left=document.getElementById("left");
var right=document.getElementById("right");
var midd=document.getElementById("midd");
var xy = document.getElementById("xy");
if (s){
xy.src = "p_w_picpaths/jt2.jpg"; //左側框架摺疊時動作按鈕的圖片
xy.alt = "展開左欄"; //左側框架摺疊時動作按鈕顯示的提示文字
left.style.display = "none"; //隱藏左側框架
midd.style.left = 0; //使動作按鈕靠近屏幕左側
right.style.left = 7; //使右側框架的左邊句等於中間框架的寬度
right.style.width=window.screen.availWidth-17; //根據分辨率自動調整右側框架的寬度
}else{
xy.src = "p_w_picpaths/jt1.jpg";
xy.alt = "隱藏左欄";
left.style.display = "";
midd.style.left = 170;
right.style.left = 177;
right.style.width=window.screen.availWidth-187;
}
s = !s;
}