var agt=navigator.userAgent.toLowerCase();
	
	    // *** BROWSER VERSION ***
	    // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
	    var is_major = parseInt(navigator.appVersion);
	    var is_minor = parseFloat(navigator.appVersion);
	
	    var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
	                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
	                && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
	    var is_nav4 = (is_nav && (is_major == 4));
	
		if (is_nav4==true) {
			document.write ("<link rel='stylesheet' href='http://www.cdc.gov/nccdphp/00_documentum_template/includes/styleNS.css' type='text/css'>");
		} else {
			document.write ("<link rel='stylesheet' href='http://www.cdc.gov/nccdphp/00_documentum_template/includes/style.css' type='text/css'>");
		}

// ******************************************************************* //
// BEGIN: Rollover script for top nav buttons
//<!--
if (document.images) {
  image1on = new Image();
  image1on.src = "http://www.cdc.gov/i/topnav_HealthSafetyTopics_on.gif";
  image1off = new Image();
  image1off.src = "http://www.cdc.gov/i/topnav_HealthSafetyTopics.gif";
  
  image2on = new Image();
  image2on.src = "http://www.cdc.gov/i/topnav_PublicationsProducts_on.gif";
  image2off = new Image();
  image2off.src = "http://www.cdc.gov/i/topnav_PublicationsProducts.gif";
  
  image3on = new Image();
  image3on.src = "http://www.cdc.gov/i/topnav_DataStatistics_on.gif";
  image3off = new Image();
  image3off.src = "http://www.cdc.gov/i/topnav_DataStatistics.gif";
  
  image4on = new Image();
  image4on.src = "http://www.cdc.gov/i/topnav_ConferencesEvents_on.gif";
  image4off = new Image();
  image4off.src = "http://www.cdc.gov/i/topnav_ConferencesEvents.gif";

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}

// -->
// END: Rollover script for top nav buttons
// ******************************************************************* //