//
// This code checks the window.location.href for a particular string and
// in conjunction with the code in the include file global_nav.html sets images to on or off states based on the results.
// Source or include this code in files ONE level down from the root (hence the 01 in the file name).
//email michael_mccrary@wgbh.org with questions, comments or improvements
//
	<!-- hide from older browsers
	
  var strString;
  var strSubString1;
  var strSubString2;
  var strSubString3;
  var strSubString4;
  var strSubString5;
  var strSubString6;
  var strSubString7;
  var strSubString8;
  var strSubString9;
  var strSubString10;

  var lngStart;
  var lngIndex1;
  var lngIndex2;
  var lngIndex3;
  var lngIndex4;
  var lngIndex5;
  var lngIndex6;
  var lngIndex7;
  var lngIndex8;
  var lngIndex9;
  var lngIndex10;
  
  var placeholder; 
  
  lngStart = 0;

  strString = window.location.href;
  strSubString1 = "/placeholder";
  strSubString2 = "/darwin";
  strSubString3 = "/change";
  strSubString4 = "/extinction";
  strSubString5 = "/survival";
  strSubString6 = "/sex";
  strSubString7 = "/humans";
  strSubString8 = "/religion";
  strSubString9 = "/library";
  strSubString10 = "/educators";

  lngIndex1 = strString.indexOf(strSubString1, lngStart);
  lngIndex2 = strString.indexOf(strSubString2, lngStart);
  lngIndex3 = strString.indexOf(strSubString3, lngStart);
  lngIndex4 = strString.indexOf(strSubString4, lngStart);
  lngIndex5 = strString.indexOf(strSubString5, lngStart);
  lngIndex6 = strString.indexOf(strSubString6, lngStart);
  lngIndex7 = strString.indexOf(strSubString7, lngStart);
  lngIndex8 = strString.indexOf(strSubString8, lngStart);
  lngIndex9 = strString.indexOf(strSubString9, lngStart);
  lngIndex10 = strString.indexOf(strSubString10, lngStart);

	
	if (document.images) {

		// Active images
		img1on = new Image();           
		img1on.src = "../../nav/images/nav_logo_ovr.gif";  
		img2on = new Image(); 
		img2on.src = "../../nav/images/nav_dar_ovr.jpg";  
		img3on = new Image();
		img3on.src = "../../nav/images/nav_cha_ovr.jpg";
		img4on = new Image();
		img4on.src = "../../nav/images/nav_ext_ovr.jpg";
		img5on = new Image();
		img5on.src = "../../nav/images/nav_sur_ovr.jpg";
		img6on = new Image();
		img6on.src = "../../nav/images/nav_sex_ovr.jpg";
		img7on = new Image();
		img7on.src = "../../nav/images/nav_hu_ovr.jpg";
		img8on = new Image();
		img8on.src = "../../nav/images/nav_rel_ovr.jpg";
		img9on = new Image();
		img9on.src = "../../nav/images/nav_lib_ovr.jpg";
		img10on = new Image();
		img10on.src = "../../nav/images/nav_ts_ovr.jpg";
		img11on = new Image();
		img11on.src = "../../nav/images/sub_nav_lib_h.gif";
		img12on = new Image();
		img12on.src = "../../nav/images/sub_nav_tea_h.gif";
		img13on = new Image();
		img13on.src = "../../nav/images/sub_nav_stu_h.gif";
		
		// Inactive images
		img1off = new Image();          
		img1off.src = "../../nav/images/nav_logo_off.gif"; 
		img2off = new Image();
		img2off.src = "../../nav/images/nav_dar_off.jpg";  
		img3off = new Image();
		img3off.src = "../../nav/images/nav_cha_off.jpg";
		img4off = new Image();
		img4off.src = "../../nav/images/nav_ext_off.jpg";
		img5off = new Image();
		img5off.src = "../../nav/images/nav_sur_off.jpg";  
		img6off = new Image();
		img6off.src = "../../nav/images/nav_sex_off.jpg";
		img7off = new Image();
		img7off.src = "../../nav/images/nav_hu_off.jpg";
		img8off = new Image();
		img8off.src = "../../nav/images/nav_rel_off.jpg";
		img9off = new Image();
		img9off.src = "../../nav/images/nav_lib_off.jpg";
		img10off = new Image();
		img10off.src = "../../nav/images/nav_ts_off.jpg";
		img11off = new Image();
		img11off.src = "../../nav/images/sub_nav_lib.gif";
		img12off = new Image();
		img12off.src = "../../nav/images/sub_nav_tea.gif";
		img13off = new Image();
		img13off.src = "../../nav/images/sub_nav_stu.gif";

		// Secondary Images
		img1ad = new Image();         
		img1ad.src = "../../nav/images/nav_logo_txt_ovr.gif";  		
		img2ad = new Image();
		img2ad.src = "../../nav/images/nav_dar_txt_ovr.gif";  
		img3ad = new Image();         
		img3ad.src = "../../nav/images/nav_cha_txt_ovr.gif";  
		img4ad = new Image();
		img4ad.src = "../../nav/images/nav_ext_txt_ovr.gif";  
		img5ad = new Image();         
		img5ad.src = "../../nav/images/nav_sur_txt_ovr.gif";  
		img6ad = new Image();
		img6ad.src = "../../nav/images/nav_sex_txt_ovr.gif";
		img7ad = new Image();
		img7ad.src = "../../nav/images/nav_hu_txt_ovr.gif";   
		img8ad = new Image();
		img8ad.src = "../../nav/images/nav_rel_txt_ovr.gif";  
		img9ad = new Image();
		img9ad.src = "../../images/spacer.gif";   	
		img10ad = new Image();
		img10ad.src = "../../images/spacer.gif";
		
		img1txt = "";
		img2txt = "Darwin: Discover the power of Darwin's \"dangerous idea.\"";
		img3txt = "Change: Explore the history of life's great transformations.";
		img4txt = "Extinction: Find out what triggers mass extinctions -- and if one is happening now.";
		img5txt = "Survival: Life is a struggle. See what it takes to survive.";
		img6txt = "Sex: Learn the rules of the mating game.";
		img7txt = "Humans: Investigate the record of our family's history.";
		img8txt = "Religion: Consider how science and faith can be reconciled.";
		img9txt = "";
		img10txt = "";
		img11txt = "Explore a multimedia library featuring video clips and web activities.";
		img12txt = "Professional development courses, teaching strategies, and lesson plans.";
		img13txt = "Seven short videos to spur classroom discussions about evolution.";
		
		function imgOn(imgName) {
		        if (document.images) {
		            document[imgName].src = eval(imgName + "on.src");
		            var changeDiv = document.getElementById('smallTextDesc');
		            changeDiv.innerHTML = eval(imgName + "txt");
		            //document["holder"].src = eval(imgName + "ad.src"); // Added line!
		        }
		}


		function imgOff(imgName) {
		        if (document.images) {
		            document[imgName].src = eval(imgName + "off.src");
		            var changeDiv = document.getElementById('smallTextDesc');
		            changeDiv.innerHTML = "";
		            //document["holder"].src = "../../images/spacer.gif";  // Added line!
		        }
		}
		
		function submitVideo() {
				document.videosearch.submit();
		}	

		function submitWebAct() {
				document.webactsearch.submit();
		}
		
}//-->