document.onkeydown = function(e){
 // get key code
 var key_code = (window.event) ? event.keyCode : e.which;
 var ctrl_key = (window.event) ? event.ctrlKey : e.ctrlKey;

 // case : if key is F5 or ctrl+n or ctrl+r then avoid it
 if ( key_code==116 || ctrl_key && (key_code == 78 || key_code == 82) ) {
   // case :if it is IE event
   if (window.event) {
     window.event.returnValue = null;
     event.keyCode=0;
   } else {
     // case: if it is firefox event
     e.preventDefault();
   }
 }
}

function navOver(highlight) {
  if (document.all) {
    choose = eval(highlight);
    choose.style.background="#ebebeb";
  }
}
function navOut(highlight) {
  if (document.all) {
    choose = eval(highlight);
    choose.style.background='#F9F9F9';
  }
}

function winpop()
{
  window.open('pop.html','popwindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=400,height=350,top=100,left=200');
}

function Cookie(document, name, hours, path, domain, secure) {
    this.$document = document;
    this.$name = name;
    if (hours)
        this.$expiration = new Date((new Date()).getTime() + hours*3600000);
    else 
        this.$expiration = null;
    if (path) this.$path = path; else this.$path = null;
    if (domain) this.$domain = domain; else this.$domain = null;
    if (secure) this.$secure = true; else this.$secure = false;
}

function _Cookie_store() {
    var cookieval = "";
    for(var prop in this) {

        if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function')) 
            continue;
        if (cookieval != "") cookieval += '&';
        cookieval += prop + ':' + escape(this[prop]);
    }

    var cookie = this.$name + '=' + cookieval;
    if (this.$expiration)
        cookie += '; expires=' + this.$expiration.toGMTString();
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    if (this.$secure) cookie += '; secure';

    this.$document.cookie = cookie;
}

function _Cookie_load() {
    var allcookies = this.$document.cookie;
    if (allcookies == "") return false;

    var start = allcookies.indexOf(this.$name + '=');
    if (start == -1) return false;   
    start += this.$name.length + 1;  
    var end = allcookies.indexOf(';', start);
    if (end == -1) end = allcookies.length;
    var cookieval = allcookies.substring(start, end);

    var a = cookieval.split('&');  
    for(var i=0; i < a.length; i++) 
        a[i] = a[i].split(':');

    for(var i = 0; i < a.length; i++) {
        this[a[i][0]] = unescape(a[i][1]);
    }
    return true;
}

function _Cookie_remove() {
    var cookie;
    cookie = this.$name + '=';
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    cookie += '; expires=Fri, 31-Jan-2001 00:00:00 GMT';

    this.$document.cookie = cookie;
}

new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;

function Popup(site, strPage) {
    var exp = 8760;
    var page = strPage;
    var windowprops = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width=500,height=550";
    var temp = new Cookie(document, "sfkorean", exp);

    if (!temp.load()) {
        temp.firstload = site;
        temp.store();
            subwin=window.open(page, "intro", windowprops);
    }
}