HIde Quick Launch in SharePoint 2010

1.Open SharePoint site--> Site Actions-->Site settings-->Under "Look and Feel"-->Tree View--->Clear the check box before "Enable Quick Launch".

updated: use the below script to completely hide Quicklaunch alongwith RecycleBin and ViewAllSiteContent


<style type="text/css">
#s4-leftpanel
{
display:none
}
.s4-ca
{
margin-left:0px
}

</style>