function fillSub(formstem){
	// move filter values to real form as comma-delimited
	var fakeformid = formstem + "fakeform";
	var realformid = formstem + "realform";
	var cSet=document.forms[fakeformid].elements;
	for(var i=0;i<cSet.length;i++){
		if(cSet[i].type=='checkbox'){
			if (cSet[i].checked){
				//do something
				document.forms[realformid][formstem].value += cSet[i].value + "-";
			}
		}
	}
	var filter = document.forms[realformid][formstem].value;
	filter = filter.substr(0, filter.length-1);
	document.forms[realformid][formstem].value = filter;
	document.forms[realformid].submit();
}

function showFilter (id){
	var disp = document.getElementById(id);
	disp.style.display = (disp.style.display=='block')? 'none':'block';
	return true;
}