html - Center image in relationship to width -


i trying center navigation bar on webpage. have min width 945px , 50% of screen if it's past width. want centered shift left 50% need adjust margin. how code width/2?

#navbarimg {     position:absolute;     left:50%;     width:50%;     margin-left:-(width/2);     top:50px;     z-index:2;     min-width:945px; }  <body>  <div id="container"> <div id="navbar"> <img id="navbarimg" src="../navigation/navbarbgimg.png" /> <img id="navbarlogo" src="../navigation/navbarlogo.png" /> <div id='navmenupart1' class="navmenu"> <ul>    <li><a href='#'><span>research</span></a></li>    <li><a href='#'><span>team</span></a></li>    <li><a href='#'><span>news</span></a></li>    <li><a href='#'><span>courses</span></a></li>    <li><a href='#'><span>outreach</span></a></li>    <li><a href='#'><span>contact</span></a></li> </ul> </div> </div> </div>  </body> </html>

set margin-left , margin-right auto , center div (also take of left: 50%). if doesn't work, post code on jsfiddle.net


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