function showUsers(login)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="ajax/registration.php";
url+="?login="+login;
xmlHttp.onreadystatechange=function stateChanged(){ 
	if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
		document.getElementById("err_login").innerHTML=xmlHttp.responseText;
	}
}
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
/////////////////////Kontrola formulare
function checkForm(section){
	var error="";	
	if (document.getElementById('login').value == ''){
        		document.getElementById("err_login").innerHTML="Nezadali jste přihlašovací jméno";
				error = 1;
    }
	if (document.getElementById('login').value != ''){
				showUsers(document.getElementById('login').value);
				if(document.getElementById("err_login").innerHTML.length == 37){
					error = 1;
				}
        		document.getElementById("err_login").innerHTML="";
    }
	if(document.getElementById('id').value ==""){
		if (document.getElementById('pass').value == ''){
					document.getElementById("err_pass").innerHTML="Nezadali jste heslo";
					error = 1;
		}
		if (document.getElementById('pass').value != ''){
					document.getElementById("err_pass").innerHTML="";
		}
		
		if (document.getElementById('pass2').value == ''){
					document.getElementById("err_pass2").innerHTML="Nezadali jste ověřovací heslo";
					error = 1;
		}
		if (document.getElementById('pass2').value != ''){
					document.getElementById("err_pass2").innerHTML="";
		}
		if (document.getElementById('pass').value != document.getElementById('pass2').value){
        		document.getElementById("err_pass").innerHTML="Ověřovací heslo není totožné s heslem";
				document.getElementById('pass').value="";
				document.getElementById('pass2').value="";
				error = 1;
    	}
		if ((document.getElementById('pass').value == document.getElementById('pass2').value)&& (section == "add")){
        		document.getElementById("err_pass").innerHTML="";
    	}
	}
	if (document.getElementById('email').value == ''){
        		document.getElementById("err_email").innerHTML="Nezadali jste Váš email";
				error = 1;
    }
	if (document.getElementById('email').value != ''){
        		document.getElementById("err_email").innerHTML="";
    }
	
	if (document.getElementById('name').value == ''){
        		document.getElementById("err_name").innerHTML="Nezadali jste Vaše jméno";
				error = 1;
    }
	if (document.getElementById('name').value != ''){
        		document.getElementById("err_name").innerHTML="";
    }
	
	if(error != ""){
	 return false;
	}
	else{
	 document.getElementById("auth").value = "ok";
	 return true;
	}
}
function checkFormArticle(section){
	var error="";	
	
	if (document.getElementById('login').value == ''){
        		document.getElementById("err_login").innerHTML="Nezadali jste přihlašovací jméno";
				error = 1;
    }
	if (document.getElementById('login').value != ''){
        		document.getElementById("err_login").innerHTML="";
    }
	if(document.getElementById('id').value ==""){
		if (document.getElementById('pass').value == ''){
					document.getElementById("err_pass").innerHTML="Nezadali jste heslo";
					error = 1;
		}
		if (document.getElementById('pass').value != ''){
					document.getElementById("err_pass").innerHTML="";
		}
		
		if (document.getElementById('pass2').value == ''){
					document.getElementById("err_pass2").innerHTML="Nezadali jste ověřovací heslo";
					error = 1;
		}
		if (document.getElementById('pass2').value != ''){
					document.getElementById("err_pass2").innerHTML="";
		}
		if (document.getElementById('pass').value != document.getElementById('pass2').value){
        		document.getElementById("err_pass").innerHTML="Ověřovací heslo není totožné s heslem";
				document.getElementById('pass').value="";
				document.getElementById('pass2').value="";
				error = 1;
    	}
		if ((document.getElementById('pass').value == document.getElementById('pass2').value)&& (section == "add")){
        		document.getElementById("err_pass").innerHTML="";
    	}
	}
	if (document.getElementById('email').value == ''){
        		document.getElementById("err_email").innerHTML="Nezadali jste Váš email";
				error = 1;
    }
	if (document.getElementById('email').value != ''){
        		document.getElementById("err_email").innerHTML="";
    }
	
	if (document.getElementById('name').value == ''){
        		document.getElementById("err_name").innerHTML="Nezadali jste Vaše jméno";
				error = 1;
    }
	if (document.getElementById('name').value != ''){
        		document.getElementById("err_name").innerHTML="";
    }
	
	if(error != ""){
	 return false;
	}
	else{
	 document.getElementById("auth").value = "ok";
	 return true;
	}
}
function removeImage(id)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="ajax/delete_foto_user.php";
url+="?id="+id;
	xmlHttp.onreadystatechange=function stateChanged(){ 
		if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
			document.getElementById("foto").innerHTML=xmlHttp.responseText;
		}
	}
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}