var aImOn = new Array();
var aImOff = new Array();

function addImg(sImg,sOn,sOff) {
  aImOn[sImg] = new Image();
  aImOn[sImg].src = sOn;
  aImOff[sImg] = new Image();
  aImOff[sImg].src = sOff;
  }

function imgOn(oIm) {
  sIm = oIm.name;
  oIm.src = aImOn[sIm].src;
  }

function imgOff(oIm) {
  sIm = oIm.name;
  oIm.src = aImOff[sIm].src;
  }

function imgOnMulti(oIm) {
  if ( (iPos = oIm.name.lastIndexOf("_")) > 0) {
    sIm = oIm.name.substring(0, iPos);
    oIm.src = aImOn[sIm].src;
    }
  }

function imgOffMulti(oIm) {
  if ( (iPos = oIm.name.lastIndexOf("_")) > 0) {
    sIm = oIm.name.substring(0, iPos);
    oIm.src = aImOff[sIm].src;
    }
  }

function setCurrent(sImg) {
	if (typeof aImOff[sImg] != 'undefined') {
		aImOff[sImg].src = aImOn[sImg].src;
		document.images[sImg].src = aImOn[sImg].src;
	}
}

addImg('home','nav/home_up.jpg','nav/home_over.jpg');
addImg('newsletters','nav/newsletters_up.gif','nav/newsletters_over.gif');
addImg('photos','nav/photos_up.gif','nav/photos_over.gif');
addImg('gigs','nav/gigs_up.jpg','nav/gigs_over.jpg');
addImg('music','nav/music_up.jpg','nav/music_over.jpg');
addImg('merchandise','nav/merchandise_up.jpg','nav/merchandise_over.jpg');
addImg('contact','nav/contact_up.jpg','nav/contact_over.jpg');