function mdiv (){
	this.root;//选择框
	this.selroot;//选择框选中后更改的区域
	this.seldiv;//浮动层最外层
	this.cnt;//选项最外层,所有选项都要添加到这里
	this.length = 0;//选项数量；
	this.value;//当前选项值
	this.items = [];//所有选项
	this.selectIndex = 0;//当前选项序号
	this.onchange = function (){};//选择事件函数
}
mdiv.activeDiv = null;
mdiv.curRoot = null;
mdiv.prototype.isIE=function (){
	return (navigator.userAgent.toLowerCase().indexOf("ie")  > -1);
}
mdiv.prototype.getOffset=function (element){//计算对象在页面上的位置
	  var valueT = 0, valueL = 0; 
	  do {valueT += element.offsetTop || 0; 
		valueL += element.offsetLeft || 0; 
		element = element.offsetParent; }
		while (element); 
	  return [valueL, valueT];	
}
mdiv.prototype.init=function (root,selroot) {
	var me = this;
	me.root = root;
	me.selroot = selroot || root;
	me.seldiv = mdiv.Create("div",false,"mdiv");
	me.cnt = mdiv.Create("div",me.seldiv);
	me.seldiv.style.display = "none";
	try{
		document.attachEvent("onmousedown",function(){me.disdiv();});
	}
	catch (ex){
		document.addEventListener("mousedown",function(){me.disdiv();}, false);
	}
	
	me.root.onclick = function (){
		me.show();
		me.HideSome();
		me.autoHeight();
	}
	
}
mdiv.prototype.select=function (obj) {
	var me = this;
	var value = obj.getAttribute("sel_value");
	me.value = value;
	me.selectIndex = obj.getAttribute("sel_index");
	me.selroot.style.padding = 0;
	me.selroot.innerHTML = obj.innerHTML;
	me.selroot.style.paddingTop="10px";
	me.onchange();
	me.hide();
	switch(me.value){
		case "book":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>书名";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>作者";
			document.getElementById('change').innerHTML=str;
			break;
		case "qikan":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>标题";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>作者";
			str+="<input onclick='sshow(\"3\")' type='radio' value='3' name='radio'/>刊名";
			str+="<input onclick='sshow(\"4\")' type='radio' value='4' name='radio'/>关键词";
			str+="<input onclick='sshow(\"6\")' type='radio' value='6' name='radio'/>作者单位";
			document.getElementById('change').innerHTML=str;
			break;
		case "baozhi":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>标题";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>作者";
			str+="<input onclick='sshow(\"3\")' type='radio' value='3' name='radio'/>来源";
			document.getElementById('change').innerHTML=str;
			break;
		case "xwlunwen":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>标题";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>作者";
			str+="<input onclick='sshow(\"4\")' type='radio' value='4' name='radio'/>授予单位";
			str+="<input onclick='sshow(\"3\")' type='radio' value='3' name='radio'/>关键词";
			document.getElementById('change').innerHTML=str;
			break;
		case "hylunwen":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>标题";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>作者";
			str+="<input type='radio' value='3' name='radio' onclick='sshow(\"3\")' />关键词";
			str+="<input type='radio' value='4' name='radio' onclick='sshow(\"4\")' />会议名称";
			document.getElementById('change').innerHTML=str;
			break;
		case "zl":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>专利名称";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>申请号";
			str+="<input type='radio' value='3' name='radio' onclick='sshow(\"3\")' />发明人";
			str+="<input type='radio' value='4' name='radio' onclick='sshow(\"4\")' />IPC号";
			document.getElementById('change').innerHTML=str;
			break;
		case "bz":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>标准号";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>标准中文名";
			str+="<input type='radio' value='3' name='radio' onclick='sshow(\"3\")' />标准英文名";
			document.getElementById('change').innerHTML=str;
			break;
		case "video":
			document.getElementById('change').style.display='block';
			var str='';
			str+="<input onclick='sshow(\"all\")' type='radio' value='all' checked='checked' name='radio' />全部字段";
			str+="<input onclick='sshow(\"1\")' type='radio' value='1' name='radio'/>视频名称";
			str+="<input onclick='sshow(\"2\")' type='radio' value='2' name='radio'/>简介";
			str+="<input type='radio' value='3' name='radio' onclick='sshow(\"3\")' />字幕";
			str+="<input type='radio' value='4' name='radio' onclick='sshow(\"4\")' />主题词";
			document.getElementById('change').innerHTML=str;
			break;
		case "info":
			break;
		default:
			document.getElementById('change').style.display='none';
			break;
		
	}
}
mdiv.prototype.show=function () {
	var me = this;
	var pos = me.getOffset(me.root);
	var seldiv = me.seldiv;
	if(seldiv.style.display != "none"){
		seldiv.style.display = "none";
		return;
	}
	var ss=seldiv.style;
	ss.clear="both";
	ss.background="#fff";
	ss.border="solid 1px #0bad85";
	ss.borderTop="none";
	ss.textIndent="3px";
	ss.position = "absolute";
	ss.left = pos[0] + "px";
	ss.zIndex=99999;
	ss.top= pos[1] + me.root.offsetHeight + "px";
	//alert(pos[0]);
	ss.width = (me.root.offsetWidth-((document.compatMode == "BackCompat")?0:2) )+1+ "px";
	ss.display = "";
}
mdiv.prototype.hide=function () {
	var me = this;
	me.seldiv.style.display = "none";
}
mdiv.prototype.disdiv=function () {
	var me = this;
	//alert(me.seldiv.style.display);
	if(me.seldiv.style.display != "none"){
		me.hide();
	}
	me.ShowSome();
}
mdiv.prototype.add=function (obj,cssHover,value,selected) {
	var me=this;
	me.items.push(obj);
	obj.setAttribute("sel_value",value);
	try{
		me.cnt.appendChild(obj);
		me.length = me.items.length;
		var index = me.items.length - 1;
		obj.setAttribute("sel_index",index);
		obj.onmouseover=function(){
			obj.setAttribute("cssBack",obj.className);
			obj.className = obj.className + cssHover;
		}
		obj.onmouseout = function(){
			obj.className = obj.className.replace(cssHover,"");
		}
		obj.onmousedown = function(){
			me.select(obj);
		}	
	}
	catch(ex){}
	if(selected){
		me.select(obj);	
	}
}
mdiv.Create=function (str,parentObj,cssName){
	var obj=document.createElement(str);
	if(parentObj)
	{parentObj.appendChild(obj);}
	else
	{document.body.appendChild(obj);}
	if(cssName)obj.className=cssName;
	return obj;
}//简化
mdiv.prototype.autoHeight=function(){};
mdiv.prototype.HideSome=function(){};
mdiv.prototype.ShowSome=function(){};