Hidden columns background color in xhtml

[rhodix]

Hello,

In openoffice we use a spreadsheet with background colored cells representing a person (person A is red, Person B is yellow). We have made a calendar where every column is one day.

Each week we hide the week that's been in openoffice spreadsheet. After that we export it to xhtml. However, when we open it in a browser, some colors have changed.

This happens specifically if you hide only a few columns from a row that has more of the same background color in a sequence.

For example.

Row 6, column 2 until 10 are red. Column 11 until 18 are yellow, 19 until 27 are green.

When we hide column 2 until 6, in OpenOffice, column are 7 until 10 are still red.

However, in xhtml, these cells are yellow, and everything is shoved 5 cells to the left.

Does anyone else have this problem, or ever heard of it?