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

$(document).ready(function(){

$("#email").keyup(function() { 

var usr = $("#email").val();

if(usr.length >= 5)
{
$("#status").html('<img src="js/loader.gif" align="absmiddle">&nbsp;Kontroluji uživatelské jméno...');

    $.ajax({  
    type: "POST",  
    url: "js/check.php",  
    data: "username="+ usr,  
    success: function(msg){  
   
   $("#status").ajaxComplete(function(event, request, settings){ 

	if(msg == 'OK')
	{ 
        $("#username").removeClass('object_error'); // if necessary
		$("#username").addClass("object_ok");
		$("#zaregistrovat").attr('disabled', '');
		$(this).html('&nbsp;<img src="js/accepted.png" align="absmiddle"> <font color="Green"> Uživatelské jméno je volné. </font>  ');
	}  
	else  
	{  
		$("#username").removeClass('object_ok'); // if necessary
		$("#username").addClass("object_error");
		$(this).html(msg);
		$("#zaregistrovat").attr('disabled', 'disabled');
	}  
   
   });

 } 
   
  }); 

}
else
	{
	$("#status").html('');
	}

});

});

//-->