The 'Download Button' will always download the imageURL (the main image displayed in the gallery).
However, the 'Open Image in New Window' button (showOpenButton="TRUE") will open whatever URL is defined in the image's linkURL in a window/tab defined in the corresponding linkTarget (though it will default to opening the imageURL if the linkURL is empty or missing).
An image entry in the XML file would look something like the following:
<image imageURL="images/image.jpg" thumbURL="thumbs/thumb.jpg" linkURL="hi-res/original.jpg" linkTarget="_blank" >
You can then change the rollover tooltip for the 'Open Image' button by using the languageList Pro Option, e.g.:
languageList="Previous,Next,Start AutoPlay,Stop AutoPlay,Play Audio,Pause Audio,Go FullScreen,Exit FullScreen,Open Hi-Res Image in New Window,Download Image,About,AutoPlay ON,AutoPlay OFF"
SimpleViewer Support Team.