function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();

function sendContact() {
    var name        = document.contact_form.name.value;
    var phone       = document.contact_form.phone.value;
    var email       = document.contact_form.email.value;
    var message     = document.contact_form.message.value; 
     
    document.contact_form.contact_button.disabled=true; 
    document.contact_form.contact_button.value='ŠALjEM';

    http.open('get', 'sendContact.php?name='+name+'&phone='+phone+'&email='+email+'&message='+message+'&action=send');
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
        var update = new Array();

        if(response.indexOf('|' != -1)) {
            update = response.split('|');
            document.getElementById(update[0]).innerHTML = update[1];
         
        }
    }
}