Widget.disabled

I have a function (below) which is executed upon the clicking of a
checkbox called 'yeschk'. This function works as expected for FireFox,
i.e., the 4 widgets (nametext, emailtext, addme, and removeme) disable
or enable immediately when the 'yeschk' checkbox is clicked. But in IE,
this doesn't happen immediately. Instead, the mouse has to be clicked
somewhere else on the page, first. So in IE, to disabled/enable the 4
widgets, I need to click the 'yeschk' checkbox, then click anywhere else
except 'yeschk'. I don't understand why this is, and it is aggravating.

Is there a known trick that I could implement that would cause IE to
enable/disable the 4 widgets immediately on a 'yeschk' click?

function chkboxChange() {
document.email.nametext.disabled = !document.email.yeschk.checked;
document.email.emailtext.disabled = !document.email.yeschk.checked;
document.email.addme.disabled = !document.email.yeschk.checked;
document.email.removeme.disabled = !document.email.yeschk.checked;
}