button1up = new Image; button1up.src = "/assets/uploads/1spnav1.gif";
button1down = new Image; button1down.src = "/assets/uploads/1spnav1b.gif";

function MyMouseOverRoutine(ButtonName)
{
  if (ButtonName=="button1") {document.button1.src = button1down.src;}

}

function MyMouseOutRoutine(ButtonName)
{
   if (ButtonName=="button1") {document.button1.src = button1up.src;}
}