		<!--
		
		function preloadImg() {
		  var d = document; 
		  if (d.images) {
				if (!d.theP) {
					d.theP = new Array();
				}
				var i,j=d.theP.length,a=preloadImg.arguments;
				for (i=0; i<a.length; i++) {
					if (a[i].indexOf("#")!=0) {
						d.theP[j] = new Image();
					}
					d.theP[j++].src=a[i];
				}
			}
		}	
		
		if (document.images) {
			names = new Array	( 
								"home",
								"testing_information",
								"study_results",
								"public",
								"about",
								"help"
								);
								
			imgCollection = new Array(11);
			
			for (m=0; m<=11; m++) {
				imgCollection[m] = new Image(); 
			}
			
			
			imgCollection[0].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_home_off1.gif";
			imgCollection[1].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_testing_off1.gif";
			imgCollection[2].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_studyresults_off1.gif";
			imgCollection[3].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_public_off1.gif";
			imgCollection[4].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_about_off1.gif";
			imgCollection[5].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_help_off1.gif";
			imgCollection[6].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_home_on.gif";
			imgCollection[7].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_testing_on.gif";
			imgCollection[8].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_studyresults_on.gif";
			imgCollection[9].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_public_on.gif";
			imgCollection[10].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_about_on.gif";
			imgCollection[11].src	= "http://iccvam.niehs.nih.gov/images/ntpimages/ntp_tabs_help_on.gif";
		}
		
		
		function swap(des,num) {
			if (document.images) {
				document.images[names[des]].src = imgCollection[num].src;  
			}
		}
		
		//-->