Untitled

why doesnt anything show up?

<html>
        <head>
                <title>test</title>
                <script type="text/javascript" src="dojo/dojo.js"></script>
                <script type="text/javascript">
                        dojo.require("dojo.widget.ComboBox");

                </script>
        </head> 

        <body>
                <input dojoType="ComboBox" value="this should never be seen - it is replaced!"
                                dataUrl="127.0.0.1/~m/data.pl" style="width: 300px;" name="foo.bar">
        <body>                  
</html> 

in /home/m/ :
data.pl :
#!/usr/bin/perl

use JSON;

#print 'Content-type: text/html' . "\n\n";

$obj = {
    comboData => [["foo", "bar"], ["test", "123"]]
};

print objToJson($obj);