how to use a proxy using javascript
<p>the problem is that when i want to get the response from the server then it gives <code>null</code></p>

<pre><code>//url of web service        
url="http://www.google.com/ig/calculator?hl=en&amp;q=12INR=?GBP"
var xmlHttp=new xmlHttpRequest();
//object of xml request
xmlHttp.open('GET', url, true);
//get method
xmlHttp.onreadystatechange = function(){
try{
        if (xmlHttp.readyState != 4) 
            return;                                 
        alert(xmlHttp.responseXML);
        var result = xmlHttp.responseXML.documentElement;
        var jsonString = result.childNodes[0].nodeValue;        
        var result1 = jsonParse(jsonString); 
        alert(result1.rhs);
        document.getElementById('results').innerHTML = innerHTML;
            }
    catch(e1){alert("erroe="+e1);}
};
    xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlHttp.send(null); 

}
</code></pre>
