function checkall(box, prefix)
{
	var elms = document.getElementsByTagName("input");
	for(var i = 0; i < elms.length; i++)
		if(elms[i].id.substr(0, prefix.length) == prefix)
			elms[i].checked = box.checked;
}

function getMarked(prefix, data)
{
	var d = document.getElementById(data);
	var ret = "";
	var elms = document.getElementsByTagName("input");
	for(var i = 0; i < elms.length; i++)
		if(elms[i].id.substr(0, prefix.length) == prefix)
			if(elms[i].checked)
				if(ret == "")ret = elms[i].value;
				else ret = ret + "," + elms[i].value;
	d.value = ret;
}