problem with wrapper snippet

#
# Wrapper 
#
# Adapted  by: John Maats - john-at-pn.nl
#
# Usage:
#    Set defaults and use [ [Wrapper] ] inside your content
#
# or call it with variables (example):
#    [ [wrapper?wurl=http://www.modxcms.com&wname=Mod-X] ]
#
# Variable list:
#  $wurl      = "http://www.modxcms.com";  // What would you like to show?
#  $wname     = "<b>Mod-X</b>";          // Name to show
#  $wshowname = "1";                       // show the name? 1 yes, 0 no
#  $wwidth    = "100%";                    // width , recommended 100%
#  $wheight   = "600";                     // height, recommended 600
#  $wscroll   = "auto";                    // auto, yes or no scrollbars visible
#  $wauto     = "1";                       // auto resize 1 yes, 0 no
#  $wframe    = "1";                       // show 1, hide 0 iframe borders
#  $wlink     = "1";                       // show direct link 1 yes, 0 no
#  $wwtext    = "Click here";              // Text for direct link
#
# If variable is not set, snippet will choose following defaults

// your defaults, oh Master!
$durl      = "http://www.munyak.com/calendar/";
$dname     = "<b>Calendar</b>";
$dshowname = "1";
$dwidth    = "100%";
$dheight   = "600";
$dscroll   = "auto";
$dauto     = "1";
$dframe    = "0";
$dlink     = "1";
$dwtext    = "Click here to open in new window!";

// No need to change stuff underneath...
// set defaults...
$wrapped ="";
if (!isset($wurl)) {$wurl = $durl; }
if (!isset($wheight)) {$wheight = $dheight; }
if (!isset($wwidth)) {$wwidth = $dwidth; }
if (!isset($wscroll)) {$wscroll = $dscroll; }
if (!isset($wframe)) {$wframe = $dframe; }
if (!isset($wname)) {$wname = $dname; }
if (!isset($wshowname)) {$wshowname = $dshowname; }
if (!isset($wlink)) {$wlink = $dlink; }
if (!isset($wwtext)) {$wwtext = $dwtext; }
// check for http:// in url
if (!(eregi("http://", $wurl) || (eregi("https://",$wurl)))) {
  $wurl = "http://".$wurl;
}
// need resize?
if ($wauto == "1"){
  $xload = "iFrameHeight()";
  $wrapped .= "<script language='JavaScript'>";
  $wrapped .= "function iFrameHeight() {";
  $wrapped .= "  var h = 0;";
  $wrapped .= "  if(document.getElementById && !(document.all))";
  $wrapped .= "  {";
  $wrapped .= "    h = document.getElementById('blockrandom').contentDocument.height;";
  $wrapped .= "    document.getElementById('blockrandom').style.height = h + 60 + 'px';";
  $wrapped .= "  }";
  $wrapped .= "  else if(document.all)";
  $wrapped .= "  {";
  $wrapped .= "    h = document.frames('blockrandom').document.body.scrollHeight;";
  $wrapped .= "    document.all.blockrandom.style.height = h + 20 + 'px';";
  $wrapped .= "  }";
  $wrapped .= "}";
  $wrapped .= "</script>";
} else {
  $xload = "";
}
$wrapped .= "<script language='JavaScript'>";
$wrapped .= "function blockError(){return true;}";
$wrapped .= "window.onerror = blockError;";
$wrapped .= "</script>";
$wrapped .= "<IFRAME id='blockrandom'";
$wrapped .= "onLoad='".$xload."'";
$wrapped .= "SRC='".$wurl."'";
$wrapped .= "width='".$wwidth."' height='".$wheight."' align=top scrolling='".$wscroll."' frameborder='".$wframe."'>Sorry, your Browser does NOT SUPPORT IFRAME.<br>You may want to Upgrade your Browser.<br><a href='".$wurl."' target='_blank'>Click Here to see the page that was supposed to load.</a>".$wurl."</IFRAME>";
$wrapped .= "<div align='center'>";

// need to show name?
if ($wshowname == "1") {
  $wrapped .= $wname;
}
$wrapped .= "<br>";
// need to show link?
if ($wlink == "1") {
  $wrapped .= "<a href='".$wurl."' target='_blank'>[".$wwtext."]</a></div>";
}
return $wrapped;