var registrercheckerfunction registrercheck(){ if (document.getElementById("user").length<2)  {   document.getElementById("userdiv").innerHTML=""; return  }registrerchecker=GetXmlHttpObject()if (registrerchecker==null) { alert ("Browser does not support HTTP Request") return }var url="usercheck.php?user="+document.getElementById("user").value;registrerchecker.onreadystatechange=stateChanged4registrerchecker.open("GET",url,true)registrerchecker.send(null)}function stateChanged4() { if (registrerchecker.readyState==0) {  document.getElementById("userdiv").innerHTML="Not working.." } if (registrerchecker.readyState==4 || registrerchecker.readyState=="complete") {  document.getElementById("userdiv").innerHTML=registrerchecker.responseText } }function GetXmlHttpObject(){var registrerchecker=null;try { // Firefox, Opera 8.0+, Safari registrerchecker=new XMLHttpRequest(); }catch (e) { //Internet Explorer try  {  registrerchecker=new ActiveXObject("Msxml2.XMLHTTP");  } catch (e)  {  registrerchecker=new ActiveXObject("Microsoft.XMLHTTP");  } }return registrerchecker;}