var nn4 = (document.layers) ? true : false;
var ie4 = (document.all) ? true : false;
var dom = (document.createTextNode)? true : false;
function popup(fileUrl, winW, winH, winN) {
var winWidth = (winW)? winW : 540;
var winHeight = (winH)? winH : 590;
var winName = (winN)? winN : 'popupWin'
if (nn4 || ie4 || dom) {
posX = Math.round((screen.width - winWidth) / 2);
posY = Math.round((screen.height - winHeight) / 2);
posCode = (nn4 || dom)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
} else {
posCode = "";
}
var popupWin = window.open(fileUrl, winName,"menubar=no,toolbar=no,scrollbars=no,status=no,width=" + winWidth + ",height=" + winHeight + "," + posCode);
if (popupWin) popupWin.focus();
}