var mHome_on = new Image();
	mHome_on.src="images/menu/butt_home_n.png";
	var mHome_off = new Image();
	mHome_off.src ="images/menu/butt_home_r.png";

	var mSIA_on = new Image();
	mSIA_on.src="images/menu/butt_details_n.png";
	var mSIA_off = new Image();
	mSIA_off.src ="images/menu/butt_details_r.png";

	var mPROP_on = new Image();
	mPROP_on.src="images/menu/butt_proposal_n.png";
	var mPROP_off = new Image();
	mPROP_off.src ="images/menu/butt_proposal_r.png";

	var mTOOLS_on = new Image();
	mTOOLS_on.src="images/menu/butt_toolkit_n.png";
	var mTOOLS_off = new Image();
	mTOOLS_off.src ="images/menu/butt_toolkit_r.png";

	var mWB_on = new Image();
	mWB_on.src="images/menu/butt_webboard_n.png";
	var mWB_off = new Image();
	mWB_off.src ="images/menu/butt_webboard_r.png";

	var mCONT_on = new Image();
	mCONT_on.src="images/menu/butt_contact_n.png";
	var mCONT_off = new Image();
	mCONT_off.src ="images/menu/butt_contact_r.png";


	function swapmenu(menuid){
  	var smenu = document.getElementById(menuid);
	smenu.src= eval(menuid+"_on.src");
	}

  function swapmenuback(menuid){
  		var smenu = document.getElementById(menuid);
		smenu.src=eval(menuid+"_off.src"); 
  }