// add onload function
function addLoadF (func)
{
    var old = window.onload;
    
    if(typeof old != 'function') { 
        
        window.onload = func; 
    
    } else { 
        
        window.onload = function () {
            old();
            func();
            
        } 
    
    }
    
}



// get Ajax core
function getAjaxCore ()
{
    var xmlHTTP = null;
    
    try {
        // for W3C
        xmlHTTP = new XMLHttpRequest();
    } catch(e) {
        try {
            // for IE new
            xmlHTTP = new ActiveXObject('Msxml2.XMLHTTP');
        } catch(e) {
            try {
                // for old IE
                xmlHTTP = new ActiveXObject('Microsoft.XMLHTTP');
            } catch(e) { alert('Your browser does not support Ajax!'); return false;} 
        }
    }
    
    return xmlHTTP;
}