function editdates()
{
    var x = document.res.performance_date;
    var now = new Date();
    var monthstr = (now.getMonth()+1) + "";
    if (monthstr.length == 1) { monthstr = "0" + monthstr; }
    var daystr = now.getDate() + "";
    if (daystr.length == 1) { daystr = "0" + daystr; }
    var fulldatestr = now.getFullYear() + "-" + monthstr + "-" + daystr;
//    alert("DEBUG: fulldatestr = '" + fulldatestr + "'");
    for (var i = 0; i < x.length; i++) {
	var d = x[i].value.substring(0,10);

	// less-than-or-equal disables today's button, if you want to be strict
	if (d < fulldatestr) {
	    x[i].disabled = true;
	    // Just in case loading images causes this to be run late
	    // enough that the user could've selected something
	    // already....
	    x[i].checked = false;
//	    alert("DEBUG: disabled button '" + d + "'");
	}
    }
}