var props;
var leftPosition;
var topPosition;
var smallWindow = null;
function closeWin(){
if (smallWindow != null){
if(!smallWindow.closed)
smallWindow.close();
}
}
function openWin(imageName,imageWidth,imageHeight,pageName) {
closeWin();
leftPosition = (screen.width) ? ((screen.width-imageWidth)/2) : 10;
topPosition = (screen.height) ? ((screen.height-imageHeight)/2) : 10;
props = "width=" + imageWidth + ",height=" + imageHeight + ",top=" + topPosition + ",left=" + leftPosition;
smallWindow = window.open("",pageName,props);
smallWindow.document.writeln('');
smallWindow.document.writeln('');
smallWindow.document.writeln('Click image to close');
smallWindow.document.writeln('');
smallWindow.document.writeln('');
smallWindow.document.writeln('
');
smallWindow.document.writeln('');
smallWindow.document.writeln('');
smallWindow.document.close();
smallWindow.focus();
}