var myimages=new Array()
function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
myimages[i]=new Image()
myimages[i].src=preloadimages.arguments[i]
}
}
preloadimages("/gr_images/grosbahs_o.gif");
  var aryImages = new Array(6);
  aryImages[0] = "/gr_images/grosbahs.gif";
  aryImages[1] = "/gr_images/grosbahs_o.gif";
function chg(imgIndex, Nm) {
    document[Nm].src = aryImages[imgIndex];
}

function bilde(id, wdt, hei, ooo) 
{
var lft = Math.round((screen.width-wdt)/2);
var top = Math.round((screen.height-hei)/2);
window.open(id, ooo, "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=auto,left="+lft+",top="+top+",resizable=1,width="+wdt+",height="+hei+",copyhistory=0");
}