function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    kep1   = newImage("img/menu1_over.gif");
    kep2   = newImage("img/menu2_over.gif");
    kep3   = newImage("img/menu3_over.gif");
    kep4   = newImage("img/menu4_over.gif");
    preloadFlag = true;
  }
}

function wo() {
	siteWindow=window.open('freetrial.html','','resizable=no, scrollbars=no, menubar=no, width=500, height=500');
}

function enter(aid) {
	siteWindow=window.open('enter.php?aid=' + aid,'','resizable=no, scrollbars=no, menubar=no, width=250, height=150');
}

function straight(aid) {
	window.location.href = 'archive_article.php?aid=' + aid;
}