Paul_o_b - 5:29 pm on Sep 26, 2011 (gmt 0)

What do you man by up to the minute exactly?

overflow-y is supported in IE6 upwards and more or less every other modern browser so you will be hard pushed to find a browser these days where it doesn't work and indeed when you do find one it's not a critical issue at all and can be safely allowed to degrade.