function switchImg(m_sImageName, m_sState)
{
	if (document.images)
	{
		imgSource = document[m_sImageName].src;
		if (m_sState == "on")
		{
			onState = imgSource.replace(/_off/i,"_on");
			document[m_sImageName].src = onState;
		}
		else 
		{
			offState = imgSource.replace(/_on/i,"_off");
			document[m_sImageName].src = offState;
		}
	}
}

if (document.images)
{
  button_home_off = new Image(); button_home_off.src = "images/button_home_off.jpg";
  button_home_on = new Image(); button_home_on.src = "images/button_home_on.jpg";
  button_ourspace_off = new Image(); button_ourspace_off.src = "images/button_ourspace_off.jpg";
  button_ourspace_on = new Image(); button_ourspace_on.src = "images/button_ourspace_on.jpg";
  button_gallery_off = new Image(); button_gallery_off.src = "images/button_gallery_off.jpg";
  button_gallery_on = new Image(); button_gallery_on.src = "images/button_gallery_on.jpg";
  button_shopping_off = new Image(); button_shopping_off.src = "images/button_shopping_off.jpg";
  button_shopping_on = new Image(); button_shopping_on.src = "images/button_shopping_on.jpg";
  button_about_off = new Image(); button_about_off.src = "images/button_about_off.jpg";
  button_about_on = new Image(); button_about_on.src = "images/button_about_on.jpg";
  button_contact_off = new Image(); button_contact_off.src = "images/button_contact_off.jpg";
  button_contact_on = new Image(); button_contact_on.src = "images/button_contact_on.jpg";
  
}

function rollOn(imgName)
{
	if (document.images)
	{
		document[imgName].src = eval(imgName + '_on.src');
	}
}

function rollOff(imgName)
{
	if (document.images)
	{ 
		document[imgName].src = eval(imgName + '_off.src');
	}
}