function setCookie(name, value, expiry)
{
   if (value != null && value != "")
   {
		document.cookie = 
			name + "=" + escape(value) + "; expires=" + expiry.toGMTString() + 
				"; path=/";
   }
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
  {
	  c_start=document.cookie.indexOf(c_name + "=");
	  if (c_start!=-1)
	  { 
	    c_start=c_start + c_name.length+1;
	    c_end=document.cookie.indexOf(";",c_start);
	    if(c_end==-1)
	    {
	    	c_end=document.cookie.length;
	    }
	    
	    return unescape(document.cookie.substring(c_start,c_end));
  	 } 
  }
	return null;
}
// this deletes the cookie when called
function deleteCookie(name)
{
	if(getCookie( name ) != null)
	{
		document.cookie = name + "=" +
			";expires=Thu, 01-Jan-1970 00:00:01 GMT";
	}
}