nn4 = (document.layers)? true : false;
ie4 = (document.all)? true : false;
nn6 = (document.getElementById && !ie4)? true : false
function popupWin(fileName, windowName, winWidth, winHeight) {
if (nn4 || ie4 || nn6) {
posX = Math.round((screen.width - winWidth) / 2);
posY = Math.round((screen.height - winHeight) / 2);
posCode = (nn4 || nn6)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
} else { posCode = ""; }
newWindow = window.open(fileName,windowName,'menubar=no,toolbar=no,scrollbars=yes,status=yes,width='+winWidth+',height='+winHeight+','+posCode);
newWindow.focus();
}