If you want to hide the left quicklaunch bar on a page (for instance the home page of your intranet), you can choose a publishing page with no left bar.
But what if you want to use a webpart page ? or you started out with a team site?
Just put in a content editor on the page and add following code in html:
<style> body #s4-leftpanel { display: none; } .s4-ca { margin-left: 0px; } </style>
Now you can just hide the webpart on the page and you are done 🙂
Found this via the SharePoint branding and design blog by Erik Swenson
Where's the code to copy??
oops!!
fixed it..please deletethe space in the style tag !!