// JavaScript Document
var dragapproved=false
var minrestore=0  //该变量表示窗口目前的状态，0表示初始化状态，1表示最大化状态
var initialwidth,initialheight
//若Client浏览器为IE5.0以上版本的
var ie5=document.all&&document.getElementById
//若Client浏览器为NetsCape6。0版本以上的
var ns6=document.getElementById&&!document.all

function iecompattest(){
	return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function drag_drop(e){
	if (ie5&&dragapproved&&event.button==1){
		document.getElementById("dwindow").style.left=tempx+event.clientX-offsetx+"px"
		document.getElementById("dwindow").style.top=tempy+event.clientY-offsety+"px"
	}
	else if (ns6&&dragapproved){
		document.getElementById("dwindow").style.left=tempx+e.clientX-offsetx+"px"
		document.getElementById("dwindow").style.top=tempy+e.clientY-offsety+"px"
	}
}

function initializedrag(e){
	offsetx=ie5? event.clientX : e.clientX
	offsety=ie5? event.clientY : e.clientY
	document.getElementById("dwindowcontent").style.display="none" //此句代码可不要
	tempx=parseInt(document.getElementById("dwindow").style.left)
	tempy=parseInt(document.getElementById("dwindow").style.top)

	dragapproved=true
	document.getElementById("dwindow").onmousemove=drag_drop
}

function loadwindow(url,width,height){
	if (!ie5&&!ns6)  //若不为IE或Netscpae浏览器，则使用一般的Window.open进行弹出窗口处理
	window.open(url,"","width=width,height=height,scrollbars=1")
	else{
		document.getElementById("dwindow").style.display=''
		document.getElementById("dwindow").style.width=initialwidth=width+"px"
		document.getElementById("dwindow").style.height=initialheight=height+"px"
		document.getElementById("dwindow").style.left="80px"
		document.getElementById("dwindow").style.top=ns6? window.pageYOffset*1+30+"px" : iecompattest().scrollTop*1+30+"px"
		document.getElementById("cframe").src=url
	}
}

function maximize(){
	if (minrestore==0){
		minrestore=1 //maximize window
		document.getElementById("maxname").setAttribute("src","restore.gif")
		document.getElementById("dwindow").style.width=ns6? window.innerWidth-20+"px" : iecompattest().clientWidth+"px"
		document.getElementById("dwindow").style.height=ns6? window.innerHeight-20+"px" : iecompattest().clientHeight+"px"
	}
	else{
		minrestore=0 //restore window
		document.getElementById("maxname").setAttribute("src","max.gif")
		document.getElementById("dwindow").style.width=initialwidth
		document.getElementById("dwindow").style.height=initialheight
	}
	document.getElementById("dwindow").style.left=ns6? window.pageXOffset+"px" : iecompattest().scrollLeft+"px"
	document.getElementById("dwindow").style.top=ns6? window.pageYOffset+"px" : iecompattest().scrollTop+"px"
}

function closeit(){
	document.getElementById("dwindow").style.display="none"

}

function stopdrag(){
	dragapproved=false;
	document.getElementById("dwindow").onmousemove=null;
	document.getElementById("dwindowcontent").style.display="" //extra
}
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()');
		eval(imgObj+'.src = "'+imgSrc+'"');
	}
}

function changeImage(imgName,imgObj,layer) {
	if (document.images) {
		if (document.layers) {
			if (layer!=null){
				eval('document.layers.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
			}
			else {
				document.images[imgName].src = eval(imgObj+".src");
			}
		}
		else {
			document.images[imgName].src = eval(imgObj+".src");
		}
	}
}

// Preload Images

preload("stationsoff", "images/images/menu_06.gif")
preload("stationson", "images/images/menu_06_on.gif")
preload("homeoff", "images/images/menu_01.gif")
preload("homeon", "images/images/menu_01_on.gif")
preload("newsoff", "images/images/menu_02.gif")
preload("newson", "images/images/menu_02_on.gif")
preload("eventsoff", "images/images/menu_03.gif")
preload("eventson", "images/images/menu_03_on.gif")
preload("publicationsoff", "images/images/menu_04.gif")
preload("publicationson", "images/images/menu_04_on.gif")
preload("scienceoff","images/images/menu_05.gif")
preload("scienceon", "images/images/menu_05_on.gif")
preload("aboutoff", "images/images/menu_07.gif")
preload("abouton", "images/images/menu_07_on.gif")
preload("contactoff", "images/images/menu_08.gif")
preload("contacton", "images/images/menu_08_on.gif")
preload("picturesoff", "images/images/menu_09.gif")
preload("pictureson", "images/images/menu_09_on.gif")