function get_cookie ( cookie_name )
{
  var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

  if ( results )
    return ( unescape ( results[2] ) );
  else
    return null;
}

function get_bgcolor() {
	var prev_col = get_cookie ( "prev_col" );
	var bg_cols = new Array("green","brown","red")
	var radNum = Math.round(Math.random()*(bg_cols.length-1))
	if( prev_col != (bg_cols[radNum]) ) {
//	alert(bg_cols[radNum]);
		document.cookie = "prev_col="+bg_cols[radNum];
		document.getElementById("body_bg").className = "bg_"+bg_cols[radNum];
		document.getElementById("main-wrapper_bg").className = "main-wrapper_"+bg_cols[radNum];
	} else {
		get_bgcolor();
	}
}