function createRequestObject() {

                   var req;
                   if(window.XMLHttpRequest) {

                      req = new XMLHttpRequest();
                   }

                   else if(window.ActiveXObject) {

                      req = new ActiveXObject("Microsoft.XMLHTTP");

                   } else {

                      req = NULL;
                      alert('Im sorry, but your webbrowser dont support AJAX! Please upgrade the browser to a newer version of use Firefox!');

                   }

           return req;
          }

          var http = createRequestObject();

          //Register > Username check
          function username_check() {

                   http.open('get', '/intro/js/ajax.php?type=username&name='+document.getElementById("gebruikersnaam").value);
                   http.onreadystatechange = username_div;
                   http.send(null);

          }

          function username_div() {

                   if(http.readyState == 4 && http.status == 200) {

                      if(http.responseText) {

                         document.getElementById("username_div_show").innerHTML = http.responseText;

                      } else {

                         document.getElementById("username_div_show").innerHTML = "   ";

                      }

                   } else {

                         document.getElementById("username_div_show").innerHTML = "   ";
                   }
          }

          //Register > Password1 check
          function password1_check() {

                   http.open('get', '/intro/js/ajax.php?type=password1&name='+document.getElementById("password1").value);
                   http.onreadystatechange = password1_div;
                   http.send(null);

          }

          function password1_div() {

                   if(http.readyState == 4 && http.status == 200) {

                      if(http.responseText) {

                         document.getElementById("password1_div_show").innerHTML = http.responseText;

                      } else {

                         document.getElementById("password1_div_show").innerHTML = "   ";

                      }

                   } else {

                         document.getElementById("password1_div_show").innerHTML = "   ";
                   }
          }

          //Register > Password2 check
          function password2_check() {

                   http.open('get', '/intro/js/ajax.php?type=password2&pass1='+document.getElementById("password1").value+'&pass2='+document.getElementById("password2").value);
                   http.onreadystatechange = password2_div;
                   http.send(null);

          }

          function password2_div() {

                   if(http.readyState == 4 && http.status == 200) {

                      if(http.responseText) {

                         document.getElementById("password2_div_show").innerHTML = http.responseText;

                      } else {

                         document.getElementById("password2_div_show").innerHTML = "   ";

                      }

                   } else {

                         document.getElementById("password2_div_show").innerHTML = "   ";
                   }
          }

          //Register > Email check
          function email_check() {

                   http.open('get', '/intro/js/ajax.php?type=email&email='+document.getElementById("emailadres").value);
                   http.onreadystatechange = email_div;
                   http.send(null);

          }

          function email_div() {

                   if(http.readyState == 4 && http.status == 200) {

                      if(http.responseText) {

                         document.getElementById("email_div_show").innerHTML = http.responseText;

                      } else {

                         document.getElementById("email_div_show").innerHTML = "   ";

                      }

                   } else {

                         document.getElementById("email_div_show").innerHTML = "   ";
                   }
          }