function checkform(){
if (document.userlogin.user.value==""){
	alert("用户名不能为空！");
	document.userlogin.user.focus();
	return false;
	}
if (document.userlogin.pass.value==""){
	alert("密码不能为空！");
	document.userlogin.pass.focus();
	return false;
	}
}

var xmlHttp;
function createXMLHttpRequest() {
	if (window.ActiveXObject) {
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else if (window.XMLHttpRequest) {
		xmlHttp = new XMLHttpRequest();
	}
}

function startRequest(newno) {
	var urlstring;

	switch (newno) {
	case "1":
		urlstring="/code/yy_news.asp?t1=01 & ";
		break;
	case "2":
		urlstring="/code/yy_news.asp?t1=10 & ";
		break;
	case "3":
		urlstring="/code/yy_news.asp?t1=02 & ";
		break;
	case "4":
		urlstring="/code/yy_news.asp?t1=12 & ";
		break;
	case "5":
		urlstring="/code/yy_news.asp?t1=14 & ";
		break;
	case "6":
		urlstring="/code/yy_news.asp?t1=03&";
		break;
	case "7":
		urlstring="/code/yy_new_all.asp";
		break;
	default :
	}
	urlstring=urlstring+"?timeStamp="+new Date().getTime();
	createXMLHttpRequest();
	xmlHttp.onreadystatechange = handleStateChange;
	xmlHttp.open("GET",urlstring,true);
	xmlHttp.send(null);
}

function handleStateChange() {
	if (xmlHttp.readyState == 4) {
		if (xmlHttp.status == 200) {
			var main_new_div = document.getElementById("main_new2_r");
			if (main_new_div.hasChildNodes()) {
				main_new_div.removeChild(main_new_div.childNodes[0]);
			}
			/*var responseText = document.createTextNode(xmlHttp.responseText);*/
			main_new_div.innerHTML=xmlHttp.responseText;
			//main_new_div.innerText=unescape(xmlHttp.responseText);
		}
	}
}


var newname = new Array();
newname[0] = "new1";
newname[1] = "new2";
newname[2] = "new3";
newname[3] = "new4";
newname[4] = "new5";
newname[5] = "new6";
newname[6] = "new7";
var eName;
function changeBgImg(eName) { //去掉背景图片

	var elementid;
	for (var i=0; i<7; i++) { 
		if (document.getElementById) {
			elementid = document.getElementById(newname[i]);
		}
		else if (document.all) {
			elementid = document.all(newname[i]);
		}
		if (eName!=elementid) {
			if (elementid) {
			elementid.style.color="#000";
			elementid.style.backgroundColor="transparent";
			elementid.style.backgroundImage="url(img/bga01.jpg)";
			}
		}
		else {
			if (eName) {
				eName.style.color="#f00";
				eName.style.backgroundColor="#F5FAF9";
				eName.style.backgroundImage="none";
			}
		}
	}
}


function addEvent_new() { // 为对象增加事件
	var elementid,j;
	for (var i=0; i<7; i++) { 
		if (document.getElementById) {
			elementid = document.getElementById(newname[i]);
		}
		else if (document.all) {
			elementid = document.all(newname[i]);
		}
		if (elementid) {

			//elementid.addEventListener("click",changeBgImg(this),true);//错误
			
			//elementid.setAttribute("onmouseover","startRequest('"+eval(i+1)+"');changeBgImg(this);");	//其它 Firefox,Oprea通过 只能放在前面

			if (i==0) {elementid.onmouseover=function() {startRequest("1");changeBgImg(this);}; }  	//IE,Firefox,Oprea通过
			if (i==1) {elementid.onmouseover=function() {startRequest("2");changeBgImg(this);}; }
			if (i==2) {elementid.onmouseover=function() {startRequest("3");changeBgImg(this);}; }
			if (i==3) {elementid.onmouseover=function() {startRequest("4");changeBgImg(this);}; }
			if (i==4) {elementid.onmouseover=function() {startRequest("5");changeBgImg(this);}; }
			if (i==5) {elementid.onmouseover=function() {startRequest("6");changeBgImg(this);}; }
			if (i==6) {elementid.onmouseover=function() {startRequest("7");changeBgImg(this);}; }	
		}
	}


}