Javascript Function querying SQL Recordset in ASP page

I have an asp page with some input boxes. I have an onchange function that is fired on change of the value in the input box. What I want the function to do is take the new value entered in the text box and query it to see if it is in a SQL server table if it is not produce and error message.
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This cannot be achieved with JavaScript; you'll have to have the form submit itself when the onchange event occurs, so that your ASP can query the database to check the value.

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For IE 5.5+, Mozilla-based browsers using 1.3 or higher (e.g. Firefox 0.8+) and Safari 1.3+:

instantiate an XML Request Object:

      try {
            xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e) {
            try {
                  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (E) {
                  try {
                        xmlhttp = new XMLHttpRequest();
                  } catch (eE) {
                        alert("Could not create XMLHttpRequest object!\nPlease use a browser that supports this feature.");
                        throw "Could not create XMLHttpRequest object!\nPlease use a browser that supports this feature.";

if xmlhttp is not null or undefined, you can continue.

get the value from the drop down ( I am assuming you know how to do that), then make a request to your server where you have a file that runs the actual query:

    try {"GET", "checkvalue.asp?random=" + rand(100000000) + "&valuetocheck=" + valuetocheck, false);
      if (xmlhttp.responseText == 'value_is_valid') {
            // do something
      } else {
            // show error message
    } catch (e) {

this special asp page should not return any html, but text that you can use to determine whether the value was valid or not. The beaty of this is that it does not require a new page reload. The downside is it only works with the latest browsers
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