You can hide the logo from top using the javascript below.
You can either use it in visualforce page or add it in homepage components.
<script language="JavaScript">try{var pa=document.getElementById("phHeaderLogoImage"); pa.style.display = "none";}catch(err){alert('There was an error on this webpage='+err.description);}</script>
You can either use it in visualforce page or add it in homepage components.
