nn4 = (document.layers) ? true : false;
ie4 = (document.all) ? true : false;
dom = (document.createTextNode)? true : false;

function popupWindow(fileUrl, winW, winH, winN, scrollB) {
    var winWidth = (winW)? winW : 660;
    var winHeight = (winH)? winH : 500;
    var winName = (winN)? winN : 'popupWin'
    var scrollBars = (scrollB)? scrollB : 'auto'
    if (nn4 || ie4 || dom) {
        if (screen.width < winWidth + 50) { winWidth = screen.width - 50; scrollbars = 'yes' }
    	if (screen.height < winHeight + 100) { winHeight = screen.height - 100; scrollbars = 'yes' }
	posX = Math.round((screen.width - winWidth) / 2);
	posY = Math.round((screen.height - winHeight) / 2);
	posCode = (nn4)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
    } else {
	posCode = "";
    }
    var popupWin = window.open(fileUrl, winName,"menubar=no,toolbar=no,scrollbars=" + scrollBars + ",status=yes,resizable=yes,width=" + winWidth + ",height=" + winHeight + "," + posCode);
    if (popupWin) popupWin.focus();
}