<script type="text/javascript">

function refreshimage( ) {

$("#imgNYC").attr("src", "http://images.earthcam.com/
ec_metros/newyork/newyork/lindys.jpg"); //#imgNYC resim id si
$("#imgNYC").show();
setTimeout(refreshimage, 30000);
}

$(document).ready(function(){
$(window).load(refreshimage());
});
</script>