if (document.images) {
	brainup		= new Image();
	brainup.src	= "/images/btn-brainstatic.gif";
	braindown	= new Image();
	braindown.src	= "/images/btn-brainstatic_lit.gif";
	heartup		= new Image();
	heartup.src	= "/images/btn-heartstatic.gif";
	heartdown	= new Image();
	heartdown.src	= "/images/btn-heartstatic_lit.gif";
	lungup		= new Image();
	lungup.src	= "/images/btn-lungstatic.gif";
	lungdown	= new Image();
	lungdown.src	= "/images/btn-lungstatic_lit.gif";
}

function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval(buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval(buttonname + "up.src" );
    }
}