var ff;
/* disabled backspace key */
if(typeof window.event != 'undefined'){
    document.onkeydown = function(){if(event.srcElement.tagName.toUpperCase() != 'INPUT'){return (event.keyCode != 8);}}
}else{
    document.onkeypress = function(e){if(e.target.nodeName.toUpperCase() != 'INPUT'){return (e.keyCode != 8);}}
}

function init(){
	ff = document.myForm;
	//ff.Username.value = "";
	//ff.Password.value = "";
	ff.Username.focus();
	setTimeout("getCaptchaImg()",200);
}

function reGetCaptchaImg(){
	setTimeout("getCaptchaImg()", 500);
}

function getCaptchaImg(){
	document.getElementById("Captcha").src = "/cgi-bin/nobody/Captcha.cgi?action=get&image=login_bmp";
}

function goCheck(e){
    if(window.event && e.keyCode ==13) //IE
        check(); 
    else if(e.which == 13) // Netscape/Firefox/Opera
        check();
}

function check(){
    if(!ff){return false;}
    
    document.cookie = "x=1";
    if (document.cookie.indexOf("x=")==-1){
        alert("Browser Cookie not supported.");
        frmReload();
        return false;
    }
    var actionStr = "/cgi-bin/nobody/VerifyCode.cgi"
    actionStr += "?account="+Base64.encode(ff.Username.value+":"+ff.Password.value);
    actionStr += "&captcha_code="+ff.CaptchaCode.value;
    actionStr += "&verify_code="+getCookie("captcha");
    actionStr += "&rnd="+Math.random();
	var httpObj = createHttpRequestObj();
	httpObj.onreadystatechange = function(){
    	if (httpObj.readyState == 4 && httpObj.status == 200){
    		var objStr    = new Object();
    		objStr.strSrc = httpObj.responseText;
    		tmpStr = objStr.strSrc.split("\n");
            if (tmpStr[1] == "OK"){
                //getUserLevel();
    			setCookie("LifeTime", "");
    			setCookie("ReloWebTime", 0);
                location.href="/index.htm";
            }else{
                alert(tmpStr[1]);
                frmReload();
            }
        }
    };
	httpObj.open("get", actionStr, true);
	httpObj.send(null);
	return false;
}

function getUserLevel(){
	var httpObj = createHttpRequestObj();
	requestData = "/cgi-bin/guest/Login.cgi?rnd="+Math.random();
	httpObj.onreadystatechange = function(){
    	if (httpObj.readyState == 4 && httpObj.status == 200){
    		var objStr    = new Object();
    		objStr.strSrc = httpObj.responseText;
    		
    		if (GetCgiParam(objStr, "User-Level=") == 1){
    			setCookie("LifeTime", "");
    			if(objStr.strGet == "SUPERVISOR")
                    location.href="/index.htm";
                else
                    location.href="/default.htm";
            }else{alert('Login Failed.');}
    	}
    };
	httpObj.open("get", requestData, true);
	httpObj.send(null);
}

function frmReload(){
    ff.Username.value="";
    ff.Password.value="";
    ff.CaptchaCode.value="";
    location.reload();
}

function getCookie(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 "";
}

function setCookie(c_name,value,expiredays){
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function createHttpRequestObj(){
	var XMLhttpObject = null;
	try {XMLhttpObject = new XMLHttpRequest();}
	catch(e){
		try {XMLhttpObject = new ActiveXObject("Msxml2.XMLHTTP");}
		catch(e){
			try {XMLhttpObject = new ActiveXObject("Microsoft.XMLHTTP");}
			catch(e) {return null;}
		}
	}
	return XMLhttpObject;
}

function GetCgiParam(objStr, strSearch){
	var curr_pos;var result;
	objStr.strSearch=strSearch;
	objStr.curr_pos=0;
	do{
		result = 1;
		curr_pos = objStr.strSrc.indexOf(objStr.strSearch, objStr.curr_pos);
		if (curr_pos < 0){
			result = 0;
			break;
		}
		objStr.curr_pos = curr_pos + objStr.strSearch.length;
		curr_pos = objStr.strSrc.indexOf('\n', objStr.curr_pos);
		if (curr_pos < 0){
			if (objStr.curr_pos < objStr.strSrc.length){
				objStr.strGet 	= objStr.strSrc.substring(objStr.curr_pos, objStr.strSrc.length);
				objStr.curr_pos = curr_pos;	
				break;
			}
			result = 0;
			break;
		}
		objStr.strGet 	= objStr.strSrc.substring(objStr.curr_pos, curr_pos);
		objStr.curr_pos = curr_pos;
	} while(0);
	return result;
}