how to display response text as html and at the same time send to a php page

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PHP

Ajax

calculate.php

    <form method="post" name="frm_deptcal" id="frm_deptcal"     action="javascript:add(document.getElementById('frm_deptcal'));" >
    <span style="font-weight:bold;">Enter your total unsecured* debt </span>
    <input type="text" name="txt_principal" id="txt_principal" / >
    <input type="submit" name="button" value="Calculate" style="background: none repeat scroll 0% 0% rgb(51, 136, 180); color: white; border: 5px solid rgb(120, 176, 205); cursor: pointer;">
    </form>


in ajax_cal.js i have add() in which XMLHttpRequestObject is created and string is  send
code :

   <pre> var str1= "txt_principal=" + document.getElementById("txt_principal").value;
    XMLHttpRequestObject.onreadystatechange = show;
    XMLHttpRequestObject.open('POST', 'value.php', true);
    XMLHttpRequestObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    XMLHttpRequestObject.send(str1);

In value.php i have done calculation:

    $principal=$_POST['txt_principal'];
    $x=0.3;
    $consumer_mon_pay=60;
    $mp_consumer_ans=($principal * $x)/$consumer_mon_pay;
    $mp_consumer=round($mp_consumer_ans,3)   ;
    echo $mp_repay."[BRK]".$mp_conloan."[BRK]".$mp_credit."[BRK]".$mp_consumer;

 and in ajax_cal.js  i have got the response as html and showed in textbox

    function show()
    {
        if (XMLHttpRequestObject.readyState == 4)
        {
            if (XMLHttpRequestObject.status == 200)
            {
                data = XMLHttpRequestObject.responseText.split("[BRK]");
                document.getElementById('txt_mp_repay').innerHTML = data[0];
                document.getElementById('txt_mp_conloan').innerHTML = data[1];
                document.getElementById('txt_mp_credit').innerHTML = data[2];
                document.getElementById('txt_mp_consumer').innerHTML = data[3];

            }
        }

    }

now my problem is I have to plot a dynamic graph whose x -axis should be the (txt_mp_repay,txt_mp_conloan,txt_mp_credit,txt_mp_consumer ) values and y -axis will be txt_mp_repay value .the bar graph coding is done using open-flash chart in chart-data.php through which I have created a static graph.Problem is how to send the response to chart-data.php and show the whole thing on calculate .php page.Help me...Thanks