function changeColour(elementId) {
var interval = 500;
var colour1 = "#2646a1", colour2 = "#d60000";
if (document.getElementById) {
var element = document.getElementById(elementId);
element.style.color = (element.style.color == colour1) ? colour2 : colour1;
setTimeout("changeColour('" + elementId + "')", interval);
}
}