rem: var f_url = document.getElementById("f_url"); 
add: var f_url = document.getElementById("uploadForm:f_url"); 
context: function onPreview() {  var f_url = document.getElementById("f_url");  var url = f_url.value;  if (!url) {    alert("You have to enter an URL first");    f_url.focus();    return false;  }  window.ipreview.location.replace(url);  return false;};
meta: 7499	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7499/cdb163ed646278867fde9ca5319aff97820eab38/HTMLAreaImageChooser.js/clean/resources/htmlarea/plugins/Selectdocument/popups/HTMLAreaImageChooser.js