pic1 = new Image(16, 16);
pic1.src="images/loader.gif";

$(document).ready(function(){
	$("#username").keyup(function() { 
		var usr = $("#username").val();
		
		if(IsName(usr)==false){
			$("#un_info").removeClass("info");
			$("#un_info").removeClass("ok");
			$("#un_info").addClass("error");
			$("#username_ok").val('');
			$("#un_info").html('Ungültige Zeichen vorhanden');
			return false;
		}
		
		if(usr.length >= 4)
		{
			$("#un_info").html('<img src="../images/loader.gif" align="absmiddle">');		
			$.ajax({
			type: "POST",
			url: "check_user.php",
			data: "username="+ usr,
			success: function(msg){  
		
					$("#un_info").ajaxComplete(function(event, request, settings){ 
				
							if(msg == 'OK')
							{
								$("#un_info").removeClass("info");
								$("#un_info").removeClass("error");
								$("#un_info").addClass("ok");
								$("#username_ok").val(usr);
								$(this).html('Der Name ist noch frei!');
							}
							else
							{
								$("#un_info").removeClass("info");
								$("#un_info").removeClass("ok");
								$("#un_info").addClass("error");
								$("#username_ok").val('');
								$(this).html(msg);
							}  
			
				 });
	
	 } 
	
	}); 
	
	}
	else
		{
		$("#un_info").html('Min. 4 Zeichen erforderlich!');
		$("#un_info").removeClass("info");
		$("#un_info").removeClass("ok");
		$("#un_info").addClass("error");
		}
	
	});

});