gistfile1.js

               var lastHeights = [];
                var i;
                for (i = 0; i < this.numColumn; i++) {
                    lastHeights[i+1] = this.gapMargin;
                }

                if (cardElems.length > 0) {
                    var x
                        , y
                        , l
                        , j
                        , currCol = 1
                        , maxHeight = 0
                        , cardColumns = 1;

                    for (i = 0, l = cardElems.length; i < l; i++) {

                        cardColumns = 1;

                        //Ensure the card isn't being deleted.
                        var cardId = cardElems[i].attributes["card-id"].value;
                        if (this.cards.get(cardId) == null) {
                            continue;
                        }

                        cardColumns = this.setCardColumns(cardElems[i]);
                        if (cardColumns > 1 && this.numColumn - currCol < (cardColumns-1)) {
                            //set height of remaining columsn to that of the previous one
                            var lastHeight = lastHeights[currCol - 1];
                            for (j = currCol; j <= this.numColumn; j++) {
                                lastHeights[j] = lastHeight;
                            }

                            //Reset currCol to 1
                            currCol = 1;
                        }

                        this.dragsters.push(new Dragster(cardElems[i]));
                        var card = cardElems[i].querySelector(".card");

                        var prevHeight = lastHeights[currCol];
                        if (cardColumns > 1) {
                            for (j = 0; j < cardColumns; j++) {
                                if (lastHeights[currCol+j] > prevHeight) {
                                    prevHeight = lastHeights[currCol+j];
                                }
                            }
                        }

                        lastHeights[currCol] = prevHeight + (card.offsetHeight + this.gapMargin);
                        if (cardColumns > 1) {
                            for(j = 0; j < cardColumns; j++) {
                                lastHeights[currCol + j] = lastHeights[currCol];
                            }
                        }

                        if (lastHeights[currCol] > maxHeight) {
                            maxHeight = lastHeights[currCol];
                        }

                        y = prevHeight;
                        x = this.leftRightPaddingMargin + ((currCol-1) * this.cardWidth) + ((currCol-1) * this.gapMargin);

                        if (cardColumns > 1) {
                            currCol = currCol + cardColumns - 1;
                        }

                        if (currCol == this.numColumn) {
                            currCol = 1;
                        } else {
                            currCol++;
                        }

                        this.moveCard(cardElems[i], x, y, i, preventDelay);
                    }
                    cardsContainer.style.height = (maxHeight + this.gapMargin) + 'px';
                }