if (document.images) 
	{

    button1_swap = new Image()
    button1_swap.src = "images/button1_over.gif"
	
	button1_off = new Image()
	button1_off.src = "images/button1.gif"
    
    button2_swap = new Image()
    button2_swap.src = "images/button2_over.gif"
    
    button2_off = new Image()
    button2_off.src = "images/button2.gif"

	button3_swap = new Image()
    button3_swap.src = "images/button3_over.gif"

	button3_off = new Image()
    button3_off.src = "images/button3.gif"
	
    button4_swap = new Image()
    button4_swap.src = "images/button4_over.gif"

    button4_off = new Image()
    button4_off.src = "images/button4.gif"

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}