var url = 'http://digacultura.net/pvr/button-small.php?url='+document.URL;

function write_iframe() {
	var span = document.getElementById("dc");
	span.innerHTML='<iframe width="25" height="19" scrolling="no" frameborder="0" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" src="'+url+'"></iframe>';
}

document.write('<span id="dc" style="width: 25px; height: 19px; border: none; padding: 0; margin: 0; background: transparent ; "><script type="text/javascript">setTimeout("write_iframe()", 1000)</script></span>');