if (document.images) {

  btn1on = new Image();
  btn1on.src = "assets/img/tab_home2.gif";
  btn1off = new Image();
  btn1off.src = "assets/img/tab_home1.gif";

	btn2on = new Image();
  btn2on.src = "assets/img/tab_newsletter2.gif";
  btn2off = new Image();
  btn2off.src = "assets/img/tab_newsletter1.gif";

	btn3on = new Image();
  btn3on.src = "assets/img/tab_calendar2.gif";
  btn3off = new Image();
  btn3off.src = "assets/img/tab_calendar1.gif";
	
	btn4on = new Image();
  btn4on.src = "assets/img/tab_roomParents2.gif";
  btn4off = new Image();
  btn4off.src = "assets/img/tab_roomParents1.gif";
	
	btn5on = new Image();
  btn5on.src = "assets/img/tab_shepherd2.gif";
  btn5off = new Image();
  btn5off.src = "assets/img/tab_shepherd1.gif";
	
	btn6on = new Image();
  btn6on.src = "assets/img/tab_donors2.gif";
  btn6off = new Image();
  btn6off.src = "assets/img/tab_donors1.gif";
	
	btn7on = new Image();
  btn7on.src = "assets/img/tab_contactUs2.gif";
  btn7off = new Image();
  btn7off.src = "assets/img/tab_contactUs1.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");
    }
  }
}