var xmlHttp;
function u_reg(field)
{
var name=field.value;
if(""!=name)
{
xmlHttp=createXmlHttpRequest();
var url="loginAction!reg?username="+name;
xmlHttp.open("GET",url,true);
xmlHttp.onreadystatechange=userName;
xmlHttp.send(null);
}
else
{
return;
}
}
function changeDrop(field
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