To insert an "Add to favorites" link, add a Widget block containing the following code (remember to edit the text marked in yellow)
<a href="#" onclick="bookmark()">Add to favorites</a><script>
function bookmark(){
var url = "https://www.sitew.com";
var title = "SiteW.com";
if (window.sidebar) {window.sidebar.addPanel(title, url, "");} else if( window.external ) { window.external.AddFavorite( url, title);}
return false}
</script>
When you upload files in the File manager, you can press the CTRL key to select several files or images at once.
An alternative solution consists in holding the mouse left click down and to drag the cursor to draw a selection "square". All the images within the "square" will be selected when you release the left click.