function xmlhttpPost(strURL) {
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('POST', "RenderPage.php", true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
            updatepage(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(getquerystring(strURL));
}

function getquerystring(strURL) {
    qstr = 'page=' + escape(strURL);  // NOTE: no '?' before querystring
    return qstr;
}

function updatepage(str){
    document.getElementById("content").innerHTML = str;
	//addStyles();
}

function addStyles(){
	var stylesheet = document.styleSheets[0];
	stylesheet.value = document.getElementById('geshi_source').innerHTML;
}