Only show image base snowflakes after the image has fully loaded #54

If the loading of the snowflake image takes a long time, empty placeholders can be seen, what looks very ugly!
Please insert following 2 lines of code after line 140 (jQuery variant):
$(flakeMarkup).css('display','none'); // Only show the snowflake after the image has been loaded
flakeMarkup.onload = function () {$(flakeMarkup).css('display','block');};