if (document.images)
	{
	pgon= new Image(251,31);
    pgon.src="images/pg-mo.jpg";
    ospgon= new Image(251,31);
    ospgon.src="images/ospg-mo.jpg";

    pgoff= new Image(251,31);
    pgoff.src="images/pg.jpg";
	ospgoff= new Image(251,31);
    ospgoff.src="images/ospg.jpg";
	}

function mouseover(imgName)
{
	if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
}

function mouseout(imgName)
{
    if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
}