function showFilterPopup(evt, filter) {
	var filter = document.getElementById(filter + 'Popup');
	var x = evt.x || evt.clientX,
        y = evt.y || evt.clientY;
	filter.style.left = x + 'px';
	filter.style.top = y + 'px';
	filter.style.visibility = "visible";	
}

function hideFilterPopup(filter) {
	var filter = document.getElementById(filter + 'Popup');
	filter.style.cursor = 'default';
	filter.style.visibility = "hidden";
}