function include( filename ) {
    // http://kevin.vanzonneveld.net
    // +   original by: mdsjack (http://www.mdsjack.bo.it)
    // +   improved by: Legaev Andrey
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Michael White (http://crestidg.com)
    // %        note 1: Force Javascript execution to pause until the file is loaded. Usually causes failure if the file never loads. ( Use sparingly! )
    // *     example 1: include('/pj_test_supportfile_2.js');
    // *     returns 1: 3
 
    var js = document.createElement('script');
    js.setAttribute('type', 'text/javascript');
    js.setAttribute('src', filename);
    js.setAttribute('defer', 'defer');
    document.getElementsByTagName('HEAD')[0].appendChild(js);
 
    // save include state for reference by include_once
    var cur_file = {};
    cur_file[window.location.href] = 1;
 
    if (!window.php_js) window.php_js = {};
    if (!window.php_js.includes) window.php_js.includes = cur_file;
    if (!window.php_js.includes[filename]) {
        window.php_js.includes[filename] = 1;
    } else {
        window.php_js.includes[filename]++;
    }
 
    return window.php_js.includes[filename];
}

function require( filename ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Michael White (http://crestidg.com)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // %        note 1: Force Javascript execution to pause until the file is loaded. Usually causes failure if the file never loads. ( Use sparingly! )
    // -    depends on: file_get_contents
    // *     example 1: require('/pj_test_supportfile_2.js');
    // *     returns 1: 4
 
    var js_code = file_get_contents(filename);
    var script_block = document.createElement('script');
    script_block.type = 'text/javascript';
    var client_pc = navigator.userAgent.toLowerCase();
    if((client_pc.indexOf("msie") != -1) && (client_pc.indexOf("opera") == -1)) {
        script_block.text = js_code;
    } else {
        script_block.appendChild(document.createTextNode(js_code));
    }
 
    if(typeof(script_block) != "undefined") {
        document.getElementsByTagName("head")[0].appendChild(script_block);
 
        // save include state for reference by include_once and require_once()
        var cur_file = {};
        cur_file[window.location.href] = 1;
 
        if (!window.php_js) window.php_js = {};
        if (!window.php_js.includes) window.php_js.includes = cur_file;
 
        if (!window.php_js.includes[filename]) {
            window.php_js.includes[filename] = 1;
        } else {
            // Use += 1 because ++ waits until AFTER the original value is returned to increment the value.
            return window.php_js.includes[filename] += 1;
        }
    }
}

function require_once(filename) {
    // http://kevin.vanzonneveld.net
    // +   original by: Michael White (http://crestidg.com)
    // -    depends on: require
    // *     example 1: require_once('/pj_test_supportfile_2.js');
    // *     returns 1: true
 
    var cur_file = {};
    cur_file[window.location.href] = 1;
 
    // save include state for reference by include_once and require_once()
    if (!window.php_js) window.php_js = {};
    if (!window.php_js.includes) window.php_js.includes = cur_file;
    if (!window.php_js.includes[filename]) {
        if(require(filename)){
            return true;
        }
    } else {
        return true;
    }
}
	
function file_get_contents( url ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Legaev Andrey
    // %        note 1: This function uses XmlHttpRequest and cannot retrieve resource from different domain.
    // *     example 1: file_get_contents('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm');
    // *     returns 1: '123'
 
    var req = null;
    try { req = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {
        try { req = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {
            try { req = new XMLHttpRequest(); } catch(e) {}
        }
    }
    if (req == null) throw new Error('XMLHttpRequest not supported');
 
    req.open("GET", url, false);
    req.send(null);
 
    return req.responseText;
}