// IMAGE SWAP
function rollOver(imageName, over) 
{
	if(window.document.images) 
  	{
    	if (over)
      		window.document.images[imageName].src = "images/navigation/" + imageName + "_over.gif";
    	else
      		window.document.images[imageName].src = "images/navigation/" + imageName + ".gif";
  	}
}