function randImg() {
  var quotenumber = 5;
  var randomnumber = Math.random() ;
  var rand1 = Math.round( (quotenumber-1) * randomnumber) + 1 ;
  quotes = new Array
  quotes[1] = '<img src="./images/header/header1.jpg" /> ';
  quotes[2] = '<img src="./images/header/header2.jpg" /> ';
  quotes[3] = '<img src="./images/header/header3.jpg" /> ';
  quotes[4] = '<img src="./images/header/header4.jpg" /> ';
  quotes[5] = '<img src="./images/header/header5.jpg" /> ';
  var quote = quotes[rand1];
  return quote;
}