var currentdate = 0;
var core = 0;

function initArray() {

this.length = initArray.arguments.length;
  for (var i = 0; i < this.length; i++) {
  this[i] = initArray.arguments[i];
  }
}

image = new initArray(
"1","2","3","4","5"
);

text = new initArray(
"ET_group","ET_group","ET_group","ET_group","ET_group"
);

var currentdate = new Date();
var core = currentdate.getSeconds() % image.length;
var ranimage = image[core];
var rantext  = text[core];

document.write('<img src=\"http://www.emgroup.nl/templates/img/changepic/'+ranimage+'.gif\" border="0" alt=\"'+rantext+'\" />');