function rollover(imagename){
	document.images[imagename].src = "images/" + imagename + "_roll.gif";
}

function rollout(imagename){
	document.images[imagename].src = "images/" + imagename + ".gif";
}

bttn_home_roll = new Image(); bttn_home_roll.src = "images/bttn_home_roll.gif";
bttn_home = new Image(); bttn_home.src = "images/bttn_home.gif";
bttn_newsroom_roll = new Image(); bttn_newsroom_roll.src = "images/bttn_newsroom_roll.gif";
bttn_newsroom = new Image(); bttn_newsroom.src = "images/bttn_newsroom.gif";
bttn_contactus_roll = new Image(); bttn_contactus_roll.src = "images/bttn_contactus_roll.gif";
bttn_contactus = new Image(); bttn_contactus.src = "images/bttn_contactus.gif";