Hiding Ribbon in CRM 2011

To hide the ribbon and to hide the empty space at the top and left side navigation.

window.top.document.getElementById("crmTopBar").style.display = "none";  //Hiding ribbon tool bar

document.getElementById("crmNavBar").parentElement.style.display = "none";  //hiding left side nav

document.getElementById("tdAreas").parentElement.parentElement.parentElement.parentElement.colSpan = 2; 

document.getElementById("recordSetToolBar").parentElement.style.display = "none";  //Hiding tool bar

document.getElementById("crmFormFooter").parentElement.style.display = "none"; //Hiding footer