if (document.images) {

  homeOff = new Image();
  homeOff.src = "images/navigation/btn_home_off.gif";
  homeOn = new Image();
  homeOn.src = "images/navigation/btn_home_on.gif";

  corporateprofileOff = new Image();
  corporateprofileOff.src = "images/navigation/btn_corporate_off.gif";
  corporateprofileOn = new Image();
  corporateprofileOn.src = "images/navigation/btn_corporate_on.gif";
  
  updatesOff = new Image();
  updatesOff.src = "images/navigation/btn_updates_off.gif";
  updatesOn = new Image();
  updatesOn.src = "images/navigation/btn_updates_on.gif";

  formsOff = new Image();
  formsOff.src = "images/navigation/btn_forms_off.gif";
  formsOn = new Image();
  formsOn.src = "images/navigation/btn_forms_on.gif";
  
  contactusOff = new Image();
  contactusOff.src = "images/navigation/btn_contact_off.gif";
  contactusOn = new Image();
  contactusOn.src = "images/navigation/btn_contact_on.gif";
}

var currentImage;


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