function menuButton(x){
  document.getElementById(x).style.background="url('images/navButtonHover.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonHoverEnd.png') no-repeat";
}

function menuButtonReturn(x){
  document.getElementById(x).style.background="url('images/navButton.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonEnd.png') no-repeat";
  
}

function greenButton(obj){
	var x = obj.id;
  document.getElementById(x).style.background="url('images/navButtonHover_green.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonHoverEnd_green.png') no-repeat";
}

function greenButtonReturn(obj){
  var x = obj.id;
  document.getElementById(x).style.background="url('images/navButton_green.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonEnd_green.png') no-repeat";
  
}
function blueButton(obj){
  var x = obj.id;
  document.getElementById(x).style.background="url('images/navButtonHover_blue.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonHoverEnd_blue.png') no-repeat";
}

function blueButtonReturn(obj){
  var x = obj.id;
  document.getElementById(x).style.background="url('images/navButton_blue.png') no-repeat";
  document.getElementById(x+'End').style.background="url('images/navButtonEnd_blue.png') no-repeat";
  
}