var fixBlocks = function() {
	var main_boxes = Ext.select('.fix_height');
	var maxh = 0;
	main_boxes.each(function(el) {
		if (maxh < el.getHeight()) {
			maxh = el.getHeight();
		}
	});
	main_boxes.each(function(el) {
		el.setHeight(maxh);
	});
};
runOnLoad(fixBlocks);