How to Set, Read and Delete Cookie using JavaScript

<script type="text/javascript"> 
// Function to set a Cookie
function vpb_set_cookie(cookie_name, cookie_value, total_days_allowed) 
{
	    if (total_days_allowed != "") 
	    {
		        var vpb_date = new Date();
		        vpb_date.setTime(vpb_date.getTime() + (total_days_allowed*24*60*60*1000));
		        var vpb_expires = ";
		 expires="+vpb_date.toGMTString();
		    }
	    else { var vpb_expires = "";
		}
	    document.cookie = cookie_name+"="+cookie_value+vpb_expires+";
	 path=/";
	}
// Function to read a Cookie
function vpb_read_cookie(cookie_name) 
{
	    var vpb_cookie_name = cookie_name + "=";
	    var split_cookie_name = document.cookie.split(';
	');
	    for( var i = 0;
	 i < split_cookie_name.length;
	 i++ ) 
	    {
		        var vpb_split_cookie_name = split_cookie_name[i];
		        while ( vpb_split_cookie_name.charAt(0)==' ' )
		        {
			            vpb_split_cookie_name = vpb_split_cookie_name.substring(1,vpb_split_cookie_name.length);
			            if ( vpb_split_cookie_name.indexOf(vpb_cookie_name) == 0 ) 
			                return vpb_split_cookie_name.substring(vpb_cookie_name.length,vpb_split_cookie_name.length);
			        }
		    }
	    return null;
	}
// Function to delete a Cookie
function vpb_delete_cookie(cookie_name) 
{
	    vpb_set_cookie(cookie_name, "", -1);
	}
//This is how you should use the above function to set the cookie with 10 days to keep the cookie active before it expires.
vpb_set_cookie('fullname','Victor Olu',10);
//This is how you should use the above function to delete your cookie - The cookie will be deleted if you uncomment the below code.
//vpb_delete_cookie('fullname');
//This is how you should use the above function to read or get your cookie after setting it.
alert( vpb_read_cookie('fullname') );

</script>