if (document.images){
	expanded = new Image();
	expanded.src="images/toggle-expand.gif"; 
}
var toggle = document.getElementById('toggle');
toggle.onclick = function() {
var expandable = document.getElementById('expandable');
var expander = document.getElementById('expander');
	if (expandable.style.display == 'none') {
		expandable.style.display = 'block';
		expander.src="images/toggle-collapse.gif";
	}
	else {
		expandable.style.display = 'none';
		expander.src=expanded.src;
	}
};