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// Prepare loader
var loaderSymbols = ['', '', ''],
	loaderEl = $(blockingOverlaySelector + ' span'),
	loaderIndex = 0,
	loader = function() {
		loaderEl.html(loaderSymbols[loaderIndex]); 
		loaderIndex = loaderIndex  < loaderSymbols.length - 1 ? loaderIndex + 1 : 0; 
	};

setInterval(loader, 350);