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/* Read a file  using xmlhttprequest

If the HTML file with your javascript app has been saved to disk,
this is an easy way to read in a data file.  Writing out is
more complicated and requires either an ActiveX object (IE)
or XPCOM (Mozilla).

fname - relative path to the file
callback - function to call with file text
*/
function readFileHttp(fname, callback) {
xmlhttp = getXmlHttp();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState==4) {
callback(xmlhttp.responseText);
}
}
xmlhttp.open("GET", fname, true);
xmlhttp.send(null);
}

/*
Return a cross-browser xmlhttp request object
*/
function getXmlHttp() {
if (window.XMLHttpRequest) {
xmlhttp=new XMLHttpRequest();
} else if (window.ActiveXObject) {
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
if (xmlhttp == null) {
alert("Your browser does not support XMLHTTP.");
}
return xmlhttp;
}

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