All I've found need fixed values for cell width and height, so if you want to keep it dynamic you're stuck with JavaScript.
One solution I like is this one, but you need to define a width for each colum. » Fixed headers in large HTML tables at The Code Project.
If you don't want to use JavaScript, maybe you can set the fixed column widths with PHP. I would determine the average string length of the cells to get the column width:
column_width = column_average / (all_cells_average * column_count) * table_width
