function showFilter(fid) {
        var IbDiv = document.getElementById(fid);
	IbDiv.style.display = 'block';
}
function hideFilter(fid) {
        var IbDiv = document.getElementById(fid);
	IbDiv.style.display = 'none';
}
function filterHigh(el) {
el.style.background='#9c0000';
el.style.color='#fff';
}
function filterLow(el) {
el.style.background='#fff';
el.style.color='#000';
}