function MM_openBrWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}

function tellAFriend (undef) {
    var baseRef = document.location.href.substring(document.location.href.lastIndexOf("index.html") + 1,location.href.length);
    baseRef = baseRef.substring(0,baseRef.lastIndexOf("."));
    var URL = "http://tellafriend.bock.com/cgi-bin/sendthis.pl?catalogname=ehobbies&item=" + baseRef;
    MM_openBrWindow(URL,'tellAFriend','scrollbars=yes,resizable=yes,width=495,height=575,left=200,top=50');
}