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i don’t know if anyone posted this yet in the comments, didn’t have the patience to read them all.
wouldn’t have been simpler to use both columns with position: relative and the LAST element in each column (a div maybe?) to have the property clear: both? that way, they both will stretch till the bottom of the page (next element they encounter – maybe the footer div).
document.getElementById(“column_right”).style.height = document.getElementById(“column_left”).offsetHeight + “px”;