function checkUser(){
        var login = $("#login").val();
        var pass1 = $("#password").val();
        var pass2 = $("#re-password").val();
        var mail  = $("#mail").val();
        var reg   = $("#reg").attr('checked');

        var valid=true;
        if (login.length==0){
            $("#login").css("border","2px solid red");
            valid=false;
        }
        else{
             $("#login").css("border","1px solid silver");
        }
        if (pass1 != pass2 || pass1=='') {
            valid=false;
            $("#password").css("border","2px solid red");
            $("#re-password").css("border","2px solid red");
        }else{
            $("#password").css("border","1px solid silver");
            $("#re-password").css("border","1px solid silver");
        }
          if (!mail.match(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/)){
            valid=false;
            $("#mail").css("border","2px solid red");
        }else{
            $("#mail").css("border","1px solid silver");
        }

        if (reg==false) {
            $("#reg").css("border","2px solid red");
            valid=false;
        }
        else{
            $("#reg").css("border","1px solid silver");
        }
        return valid;
    }