check_availability = function(){
    username_value=document.getElementById('id_username').value;
    check_url="/signup/username/availability/" ;
    $.post(check_url,{username:username_value},function(data){
		$("#available_text").html(data);
		$("#available_text").show();
	});
};


username_entered=function(e) {
    var key = e.charCode || e.keyCode || 0;
    if (key == 13) {
        check_availability();
    }
};