[Theme: Twenty Eleven] change titles

using child theme:

/*
Theme Name:     MTBClinics
Description:    Gebaseerd op twenty eleven aangepast naar MTBClinics.be
Author:         Admin
Template:       twentyeleven

(optional values you can add: Theme URI, Author URI, Version)
*/

@import url("../twentyeleven/style.css");

/*-----------------------------------------------------------------
-----------------------------body----------------------------------
-----------------------------------------------------------------*/
/*other font*/
body, input, textarea {
	font: 15px "Verdana", Verdana, Geneva, sans-serif;
}

/*-----------------------------------------------------------------
-----------------------------menu----------------------------------
-----------------------------------------------------------------*/
/*align menu left (remove left margin)*/
#access div {
	margin: 0 0 0 10px;
}
/*custom text display*/
#access a {
	color: #ececec;
	text-transform:uppercase;
	font-weight: bold;
	font-size:95%;
}
#access a:first-letter {
	font-size:130%;
}
/*search box*/
#branding #searchform {
	right: 46px;
}
#branding .only-search #s, #branding .only-search #s:focus {
    width: 88%;
}
/*menu mail img*/
li#menu-item-111 a {
	display: block;
	background-image:url('/wp-content/themes/mtbclinics/images/mail.png');
	background-repeat: no-repeat;
	width: 45px;
	height: 45px;
	text-indent: -9000px;
	padding: 0 0 0 0;
}
li#menu-item-111 a:hover {
	display: block;
	background-image:url('/wp-content/themes/mtbclinics/images/mail.png');
	background-repeat: no-repeat;
	width: 45px;
	height: 45px;
	text-indent: -9000px;
}
li#menu-item-111 {
	position:absolute;
	right:1px;
}

/*-----------------------------------------------------------------
-----------------------------entry---------------------------------
-----------------------------------------------------------------*/
/*page titel underline*/
.showcase .entry-header, .singular .entry-header {
	-moz-border-image:url(/wp-content/themes/mtbclinics/images/GreenBorder.png) 0 0 30 0 stretch;
	-webkit-border-image:url(/wp-content/themes/mtbclinics/images/GreenBorder.png) 0 0 30 0 stretch;
	-o-border-image:url(/wp-content/themes/mtbclinics/images/GreenBorder.png) 0 0 30 0 stretch;
	border-image:url(/wp-content/themes/mtbclinics/images/GreenBorder.png) 0 0 30 0 stretch;
	border-bottom-style:solid;
	border-bottom-color:#99cc00; /*for firefox*/
	background-image:url('/wp-content/themes/mtbclinics/images/mudpost_background.png' );
	background-repeat:no-repeat;
}

/*homepage only
-----------------------------------------------------------------*/
/*hide home page title */
body.home .entry-title {
	display: none;
}
/*hide comment hompage*/
body.page #comments {
	display:none;
}

/*blogpage only
-----------------------------------------------------------------*/
.page-id-3401 .entry-content h1, .entry-content h2 {
	margin: 0px 0px 0em;
}
.page-id-3401 .singular .entry-title {
    color: #000000;
    font-size: 15px;
    font-weight: bold;
    line-height: 48px;
}

/*standard layout
-----------------------------------------------------------------*/
/*page margin*/
#page {
	margin-top: -0.2%;
	margin-bottom: -2%;
}
/*remove space between content and menu*/
.entry-content, .entry-summary {
	padding: 0em 0px 0px;
}
#main {
	padding: 0em 0px 0px;
}
/*smaler margin*/
.singular #content, .left-sidebar.singular #content {
	margin: 0px 0.2%;
}
.entry-title {
	padding-bottom: 0.3em;
	padding-top: 1px;
}
.singular .entry-header, .singular .entry-content, .singular footer.entry-meta, .singular #comments-title {
	width: 90%;
}
.singular.page .hentry {
	padding: 1em 0px 0px;
}
/*page font text*/
.singular .entry-title {
	font-size: 26px;
}
.singular #content{
	font-size: 13px;
}
/*sidebar margin*/
.widget {
    margin: 0px 0px 1em;
}

/*layout whit sidebar
-----------------------------------------------------------------*/
/*margin content en sidebar*/
#content {
	margin: 0 0 0 5%;
	width: 66%;
}
#secondary {
	float: right;
	margin-right: 1%;
	width: 25%;
}

/*showcase layout
-----------------------------------------------------------------*/
/*allign schowcase left and fill full page*/
.page-template-showcase-php section.recent-posts {
	float: left;
	margin: 0px 0px 0px 0%;
	width: 95%;
}
/*make font size same as post*/
body, input, textarea {
	font: 13px "Verdana",Verdana,Geneva,sans-serif;
}

/*post layout
-----------------------------------------------------------------*/
/*change position meta (date)*/
.singular .entry-header .entry-meta {
	position: relative;
}
/*hide meta bottom*/
.singular footer.entry-meta {
	display: none;
}
.entry-header .entry-meta {
	padding-right: 0px;
	margin: 0 0 0 76%;
}

/*-----------------------------------------------------------------
----------------------------footer---------------------------------
-----------------------------------------------------------------*/
/*image in footer*/
#site-generator {
	-webkit-background-size: cover;
	-moz-background-size: cover;
	-o-background-size: cover;
	background-image: url("/wp-content/themes/mtbclinics/images/bgr_footer_img.png");
	padding: 64px;
	background-repeat: no-repeat;
	background-position: center center;
	background-size: cover;
	/*hide wordpress add*/
	text-indent: -9000px;
}
/*remove space between content and footer*/
#supplementary {
	padding: 0em 0%;
}

/*-----------------------------------------------------------------
-----------------------------plugins-------------------------------
-----------------------------------------------------------------*/
/*timely-------------------*/
/*homepage only !!!!!!!!!!!!!!!!*/
body.home h2.ai1ec-calendar-title {
	display: none;
}
body.home .timely .btn-toolbar {
	display: none;
}
/*posterbord, agenda, month dropdown button*/
body.home .ai1ec-calendar-toolbar td:first-child {
	display: none;
}

—>
http://www.pieterbroeckx.be/wp-content/uploads/2012/12/Naamloos.png
isnt the nomber in my adress bar the ID ?

thanx for support !!
i did not now that
very happy right now 😀