XMLHttpRequest Parsing problem during fetching values

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Javascript

Hi,
I am receiving data in XMLHttpRequest object and while parsing it there are two strings that have common string. If I tried to get the string it is returning the value of first occurrence. PFB the code snippet.

document.getElementById("mystring").innerHTML=func(xmlhttp.responseText,"MYSTRING");
document.getElementById("mystringnew").innerHTML=func(xmlhttp.responseText,"MYSTRINGNEW");

function func(mydata,myparam)
{
    var val;
    if(data.match(param))
    {
        var sindex=data.indexOf(param); -- At this place I am getting the index of MYSTRINGNEW instead of MYSTRING
        //alert(sindex);
     }
     return val;
}

XMLHttpResponse
---------------
'mystringnew' "Hello"
'mystring' "Hi"

so instead of receiving 'Hi' I am receiving 'Hello'

Please let me know is there any function in javascript to handle this.


Regds