#header{
 position:relative; 
 height:160px; 
 background-image:  url(http://cms.nmha.org/css/images/BG_header_homeCSS.jpg);
 background-repeat: no-repeat; 
 border: none;
 width:970px;
}
.signUpGoButton{
background: #005596 url(http://www.mentalhealthamerica.net/images/buttonGo.gif);
width: 20px;
height: 25px;
cursor: pointer;
border: none;
}
<CFSET strUAgent = CGI.HTTP_USER_AGENT>
<CFIF strUAgent CONTAINS "MSIE">
* html #header h1{
	text-indent: -9999px;
	width: 720px;
	height: 127px;
	background:      url(images/people<cfoutput>#RandRange(1, 15)#</cfoutput>.jpg) no-repeat 0px top;
	margin: 0;
	padding: 0;
	left: 256px;
	position: absolute;
	top: 0px;
}

  <CFELSE>
#header h1{
	text-indent: -9999px;
	width: 720px;
	height: 127px;
	background:      url(images/people<cfoutput>#RandRange(1, 15)#</cfoutput>.jpg) no-repeat 0px top;
	margin: 0;
	padding: 0;
	left: 256px;
	position: absolute;
	top: 0px;
}