var duma = {
$:function(o){ if(document.getElementById(o)) {return document.getElementById(o);} },
getStyle:function(o) { return o.currentStyle||document.defaultView.getComputedStyle(o,null); },
getOffset:function(o) {
var t = o.offsetTop,h = o.offsetHeight;
while(o = o.offsetParent) { t += o.offsetTop; }
return { top:t, height:h };
},
bind:function(o,eType,fn) {
if(o.addEventListener) { o.addEventListener(eType,fn,false); }
else if(o.attachEvent) { o.attachEvent("on" + eType,fn); }
else { o["on" + eType] = fn; }
},
stopEvent:function(e) {
e = e || window.event;
e.stopPropagation && (e.preventDefault(),e.stopPropagation()) || (e.cancelBubble = true,e.returnValue = false);
},
setCookie:function(c_name,value,expiredays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + expiredays);
document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
},
getCookie:function(c_name) {
if(document.cookie.length > 0) {
c_start = document.cookie.indexOf(c_name + "=");
if(c_start != -1) {
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(";",c_start);
if(c_end == -1) { c_end = document.cookie.length; }
return unescape(document.cookie.substring(c_start,c_end));
}
}
return "";
}
};
duma.BeautifyScrollBar = function(obj,arrowUpCss,arrowUpActiveCss,handleCss,handleActiveCss,arrowDownCss,arrowDownActiveCss) {
this.arrowUpInterval;
this.arrowDownInterval;
this.barMouseDownInterval;
this.relY;
this.id = obj;
this.obj = duma.$(this.id);
this.setObjCss(); //预先设置父容器的css定位才能让接下来的属性设置起作用
this.obj.innerHTML = '<div id="' + obj + 'Area" class="dumascroll_area">' + this.obj.innerHTML + '</div><div id="' + obj + 'Bar" class="dumascroll_bar"><div class="dumascroll_arrow_up"></div><div class="dumascroll_handle"></div><div class="dumascroll_arrow_down"></div></div>';
this.area = duma.$(obj + "Area");
this.bar = duma.$(obj + "Bar");
this.barPos;
this.arrowUp = this.bar.getElementsByTagName("div")[0];
this.arrowUpCss = arrowUpCss;
this.arrowUpActiveCss = arrowUpActiveCss;
this.handle = this.bar.getElementsByTagName("div")[1];
this.handleCss = handleCss;
this.handleActiveCss = handleActiveCss;
this.arrowDown = this.bar.getElementsByTagName("div")[2];
this.arrowDownCss = arrowDownCss;
this.arrowDownActiveCss = arrowDownActiveCss;
this.handleMinHeight = 15;
this.arrowUpHeight = parseInt(duma.getStyle(this.arrowUp).height);
this.arrowDownHeight = parseInt(duma.getStyle(this.arrowDown).height);
this.areaScrollHeight = this.area.scrollHeight;
this.handleHeight = parseInt(this.area.offsetHeight/this.area.scrollHeight * (this.bar.offsetHeight - this.arrowUpHeight - this.arrowDownHeight));
}
duma.BeautifyScrollBar.prototype = {
setObjCss:function() {
duma.getStyle(this.obj).position == "static" ? this.obj.style.position = "relative" : duma.getStyle(this.obj).backgroundColor == "transparent" ? this.obj.style.backgroundColor = "#fff" : null; //若容器本来就没有设position，则初始化为relative；若容器原来未设置背景色，则初始化为白色；
},
sethandle:function() { //当内容超多时设置拖拽条子的最小高度
this.handle.style.top = this.arrowUpHeight + "px";
if(this.handleHeight > this.handleMinHeight) {
this.handleHeight < this.bar.offsetHeight - this.arrowUpHeight - this.arrowDownHeight ? this.handle.style.height = this.handleHeight + "px" : this.handle.style.display =
