Creating a text area that fills the available space

I want to be able to create a text area that fills an available space.

However because of the different monitor resolutions I don't think I can simple开发者_开发百科 specify a character width. Is there anyway of getting around this without having too much logic to specify different character widths for each set of monitor resolutions.

The answer is to simple set

style="width: 100%"

instead of

cols="XX"

<textarea style='width:100%; height:100%'>type here</textarea>