Regarding checking EmailId available or not

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ASP.NET

Javascript

<script type="text/javascript">
var _txtemailID;
var _divStatus;
var _timeHandler;

function pageLoad()
{
_txtemailID=document.getElementById("<%=txtemailIID.ClientID %>");
_divStatus=document.getElementById("<%=divStatus.ClientID %>")

}
function pageUnload()
{
$removeHandler(_txtemailID,"keyup",onKeyUp);
cleartimer();
}
function onKeyUp(e)
{
setupTimer();
}
function setupTimer()
{
clearTimer();
_timeHandler=window.setTimeout(checkEmail,15000);
}
function clearTimer()
{
window.setTimeout(_timeHandler);
_timeHandler=null;
}
function checkEmail()
{
if(_txtemailID.value.lenght>5)
{
_divStatus.innerHTML='Checking...';
_divStatus.style.color='black';

PageMethods.checkEmailID(_txtemailID.value,onCheckEmailComplete,onCheckEmailError,_txtemailID.value);
}
else
{
_divStatus.innerHTML=' ';
}

}
function onCheckEmailComplete(result,usercontext)
{
if(result==true)
{
_divStatus.innerHTML=String.fomat('\'{0}\'\ is Alredy Taken',usercontext);
_divStatus.style.color='red';
}
else
{
_divStatus.innerHTML=String.fomat('\'{0}\'\ is Available',usercontext);
_divStatus.style.color='green';
}
}
function onCheckEmailError(e)
{
_divStatus.innerHTML = e.get_message();
_divStatus.style.color = 'red';
}
</script>

Sorry for inconvinence,,
Actly i want to check the availability of Username on the onBlur Event of TextBox..
I wrote that script in aspx But it does not provide the availability onBlur Event.
What should i do..