Template find-matrix-column return value is not correct for td with colspan in h2d.xsl

When I tried to convert html to dita by using h2d.xsl, I found that the namest and nameend are not correct for td with colspan. After tracing the code, I found that the error may be related the template "find-matrix-column". For the variable "next-col-count", it may need some changes.
Original:

``` xml

```

Modified:

``` xml

```

Please feel free to correct me if i am wrong. Thanks for your great effort.

Ben