Aligning header width with data

Hi, I have code where my headers are in one table inside a iframe and the data is in another table inside another iframe. this freezes the header when I scroll down. However, I fail to get the headers to align with the columns. The issue is I dont want to hardcode the widths cuz more columns could be added in the future.

any help would be appreciated.

SB

This sounds like you are putting way more effort into the page then there might need to be. I am assuming that you are using two IFrames so you can scroll the page (bottom IFrame) and the header (top IFrame) stays visible. My questions is "Why not just set the size of the grid to be the full page height and let the grid control itself. The headers don't scroll out of view under normal use. What odd thing is going on within your page that requires you to use IFrames?