function setjsreturn() {
 if (navigator.product == 'Gecko') {
  return 'mozilla';
 }
 else if (window.opera && document.childNodes) {
  return 'opera7';
 }
 else if (navigator.appName == 'Microsoft Internet Explorer' && navigator.userAgent.indexOf("Mac_PowerPC") > 0) {
  return 'konqueror';
 }
 else if (navigator.appName == 'Microsoft Internet Explorer' && document.getElementById && document.getElementById('ietest').innerHTML) {
  return 'ie';
 }
 else if (navigator.appName == 'Konqueror') {
  return 'konqueror';
 }
 else if (window.opera) {
  return 'opera';
 }
}