/*可折叠按钮代码*/

function $G(Read_Id) { return document.getElementById(Read_Id) }
var openedObjId=null
function Effect(ObjectId){
if (openedObjId){
$G(openedObjId+"tab").innerHTML = "<a href=# >+</a>";
Start(openedObjId,'Close');
}
if(openedObjId!=ObjectId){
$G(ObjectId+"tab").innerHTML = "<a href=#>-</a>";
Start(ObjectId,'Opens');
openedObjId=ObjectId
}
else openedObjId=null
}
function Start(ObjId,method){
var BoxHeight = $G(ObjId).offsetHeight; //对象高度
var MinHeight = 5;//定义最小高度
var MaxHeight = 640;//定义最大高度
var BoxAddMax = 1;//递增量初始值
var Every_Add = 0.15;//每次的递(减)增量[数值越大速度越快]
var Reduce    = (BoxAddMax - Every_Add);
var Add       = (BoxAddMax + Every_Add);
//折叠
if (method == "Close"){
var Alter_Close = function(){//构建虚拟的[递减]循环
BoxAddMax /= Reduce;
BoxHeight -= BoxAddMax;
if (BoxHeight <= MinHeight){
$G(ObjId).style.display = "none";
window.clearInterval(BoxAction);
}
else $G(ObjId).style.height = BoxHeight;
}
var BoxAction = window.setInterval(Alter_Close,1);
}
//展开
else if (method == "Opens"){
var Alter_Opens = function(){
BoxAddMax *= Add;
BoxHeight += BoxAddMax;
if (BoxHeight >= MaxHeight){
$G(ObjId).style.height = MaxHeight;
window.clearInterval(BoxAction);
}else{
$G(ObjId).style.display= "block";
$G(ObjId).style.height = BoxHeight;
}
}
var BoxAction = window.setInterval(Alter_Opens,1);
}
}