//generate random number seed
now=new Date();
seed=now.getSeconds();

number_of_pictures_minus_one=number_of_pictures - 1;

var picture_number
function random_picture_selector() {IntegerRandomNumber=Math.round((Math.random(seed) *number_of_pictures_minus_one +1)); return IntegerRandomNumber}
picture_number=random_picture_selector()
picture_url=picture_directory +  picture_number + ".jpg"
//document.writeln('<img src=" ' + picture_url + ' "   width=* height=*  >')//doesn't work in ie
document.writeln('<img class=artwork_right src=" ' + picture_url + ' " alt="enter site">')