Add margin param for image preview.

boards/static/js/image.js

@@ -1,71 +1,71 b''
 function addImgPreview() {
-    var margin = 20;
+    var margin = 20; //..change
 
     //keybind
     $(document).on('keyup.removepic', function(e) {
         if(e.which === 27) {
             $('.img-full').remove();
         }
     });
 
     $('body').on('click', '.thumb', function() {
         var el = $(this);
         var thumb_id = 'full' + el.find('img').attr('alt');
 
         if(!$('#'+thumb_id).length) {
             var img_w = el.find('img').attr('data-width');
             var img_h = el.find('img').attr('data-height');
 
             var win_w = $(window).width();
             var win_h = $(window).height();
             //new image size
             if (img_w > win_w) {
                 img_h = img_h * (win_w/img_w) - margin;
                 img_w = win_w - margin;
             }
             if (img_h > win_h) {
                 img_w = img_w * (win_h/img_h) - margin;
                 img_h = win_h - margin;
             }
 
             var img_pv = new Image();
             $(img_pv)
                 .addClass('img-full')
                 .attr('id', thumb_id)
                 .attr('src', $(el).attr('href'))
                 .appendTo($(el))
                 .css({
                     'width': img_w,
                     'height': img_h,
                     'left': (win_w - img_w) / 2,
                     'top': ((win_h - img_h) / 2)
                 })
                 //scaling preview
                 .mousewheel(function(event, delta) {
                     var cx = event.originalEvent.clientX,
                         cy = event.originalEvent.clientY,
                         i_w = parseFloat($(img_pv).width()),
                         i_h = parseFloat($(img_pv).height()),
                         newIW = i_w * (delta > 0 ? 1.25 : 0.8),
                         newIH = i_h * (delta > 0 ? 1.25 : 0.8);
 
                     $(img_pv).width(newIW);
                     $(img_pv).height(newIH);
                     //set position
                     $(img_pv)
                         .css({
                             left: parseInt(cx - (newIW/i_w) * (cx - parseInt($(img_pv).position().left, 10)), 10),
                             top:  parseInt(cy - (newIH/i_h) * (cy - parseInt($(img_pv).position().top, 10)), 10)
                         });
 
                     return false;
                 }
             ).draggable()
         }
         else {
             $('#'+thumb_id).remove();
         }
         //prevent default
         return false;
     });
 }
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