function writeMainImage(){
  var today = new Date();		  
	  if(today.getDate() >= 20 && today.getHours() >= 9) {
		document.write('<a href="summer2008.html"><img src="resources/images/mainSiteAd.jpg" alt="Just Announced!" border="0" /></a>');
	  } else {
		document.write('<img src="resources/images/welcomeImage2.jpg" alt="Welcome to UtahBlood.org" border="0" />');
	  }		  
}