// JavaScript Document
function goToURL() { //v3.0

  var i, args=goToURL.arguments; document.returnValue = false;

  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");

}

var bgs=new Array;
        bgs[0]='img/headerimg/header_1.jpg';

function randHeaderImg() {

 var num=Math.floor(Math.random()*bgs.length);

     document.getElementById('headerImg').style.backgroundImage='url('+bgs[num]+')';

}