var flag = 0;
var xml = null;
function jTrim(inputString) {
 if(typeof inputString != "string"){
	return inputString;
 }
 var retValue = inputString;
 var ch = retValue.substring(0,1);
 while(ch == " " || ch == "\r" || ch == "\n"){
	retValue = retValue.substring(1, retValue.length);
	ch = retValue.substring(0, 1);
 }
 ch = retValue.substring(retValue.length-1, retValue.length);
 while(ch == " " || ch == "\r" || ch == "\n"){
	retValue = retValue.substring(0, retValue.length-1);
	ch = retValue.substring(retValue.length-1, retValue.length);
 }
 while(retValue.indexOf("  ") != -1){
	retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); 
 }
 return retValue; 
}
function Login(){
 flag = 0;
 if(jTrim(form1.UserName.value) == "")
	flag = 1;
 else if(jTrim(form1.PassWord.value) == "")
	flag = 2;
 else if(jTrim(form1.CheckCode.value) == "")
	flag = 3;
 if(flag)
	ShowCheck();
 else{
	if(window.XMLHttpRequest){
		isIE = false;
		xml = new XMLHttpRequest();	}
	else if(window.ActiveXObject){
		isIE = true;
		xml = new ActiveXObject("Microsoft.XMLHTTP");}
	xml.onreadystatechange = getCheckLogin;
	try{
		xml.open("GET", "loginCheck.php?u="+jTrim(form1.UserName.value)+"&p="+jTrim(form1.PassWord.value)+"&c="+jTrim(form1.CheckCode.value)+"&nocache=" + Math.random(), true);
		xml.send(null);	}
	catch(e){}
 }
}
function getCheckLogin(){
 if(xml.readyState == 4)
	if(xml.status == 200){
		flag = xml.responseText;
//		alert("i am here:"+flag);
		ShowCheck();
	}
}
function FrmKeyUp(){
 if(event.keyCode == 13)
	Login();
}
function ShowCheck(){
 if(flag == 1)
	alert("请填写用户名");
 else if(flag == 2)
	alert("请填写密码");
 else if(flag == 3)
	alert("请填写附加码");
 else if(flag == 4)
	alert("用户名错误");
 else if(flag == 5)
	alert("密码错误");
 else if(flag == 6)
	alert("附加码错误");
 else if (flag == 0)
	location.href = "Index.php";
 else
   alert("不明错误"+flag);
}