if (document.images)
{ // preload our rollover images
	imgPrTipOfWeekOver = new Image();
	imgPrTipOfWeekOver.src = "/images/sub_pr_tip_over.gif";
	imgMediaCenterOver = new Image();
	imgMediaCenterOver.src = "/images/sub_media_center_over.gif";
	imgHotTopicsOver = new Image();
	imgHotTopicsOver.src = "/images/sub_hot_topics_over.gif";
	imgBecomeClientOver = new Image();
	imgBecomeClientOver.src = "/images/sub_become_client_over.gif";
	imgPrivilegesOverviewOver = new Image();
	imgPrivilegesOverviewOver.src = "/images/sub_privileges_overview_over.gif";

  // preload our normal images
	imgPrTipOfWeekOff = new Image();
	imgPrTipOfWeekOff.src = "/images/sub_pr_tip_off.gif";
	imgMediaCenterOff = new Image();
	imgMediaCenterOff.src = "/images/sub_media_center_off.gif";
	imgHotTopicsOff = new Image();
	imgHotTopicsOff.src = "/images/sub_hot_topics_off.gif";
	imgBecomeClientOff = new Image();
	imgBecomeClientOff.src = "/images/sub_become_client_off.gif";
	imgPrivilegesOverviewOff = new Image();
	imgPrivilegesOverviewOff.src = "/images/sub_privileges_overview_off.gif";

}