function imageOver(obj)
{
	var delimeter = '_on';
	var src = obj.src;
	var src_tail = src.substring(src.length-4, src.length);
	var src_name = src.substring(0, src.length-4);
	obj.src = src_name + delimeter + src_tail;
	obj.onmouseout = function()
	{
		var src = obj.src;
		var src_tail = src.substring(src.length-4, src.length);
		var src_name = src.substring(0, src.length - (4 + delimeter.length));
		obj.src = src_name + src_tail;
	}
}

var __stack = '';
function leftMenuOver(obj)
{
	__stack = obj.className;
	obj.className = 'over';
	obj.onmouseout = function()
	{
		obj.className = __stack;
	}
}

function topMenu(obj)
{
	obj.style.backgroundColor = '#EDEDED';
	var subid = obj.getAttribute('subid');
	if(subid != null)
	{
		var subObj = document.getElementById(subid);
		subObj.style.display = '';
	}
    obj.onmouseout = function()
	{
		obj.style.backgroundColor = '';
	}
        	
}