Update Ring Website - Resources Section - Short Movies - IsDigit() Function - Ring Programming Language - Lesson 87
'<a href="https://www.youtube.com/watch?v=lVXVmbcdW9U&index=87&list=PLpQiqjcu7CuH063yQeQi0LQcbV4dynHgw" target="_blank">IsCntrl() Function - Ring Programming Language - Lesson 86 </a>'
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+ '<a href="https://www.youtube.com/watch?v=FXcraRZiYtA&list=PLpQiqjcu7CuH063yQeQi0LQcbV4dynHgw&index=88" target="_blank">IsDigit() Function - Ring Programming Language - Lesson 87 </a>'
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