if (window.addEventListener) window.addEventListener('load', initBtns, false);
else window.attachEvent('onload', initBtns);


var btns;

function initBtns() {
	
	btns = document.getElementById("btn_wrap").getElementsByTagName("div");
	
	var docURL = document.URL;
	var urlSegs = docURL.split("/");
	var fileName = urlSegs.pop();
	
	var btnSet1 = new Array("summer_fellowship", "ventures2");
	var btnSet2 = new Array("summer_fellowship", "academic_resources");
	var btnSet3 = new Array("straight_talk2", "academic_resources");
	var btnSet4 = new Array("summer_fellowship2", "incubator");
	var btnSet5 = new Array("summer_fellowship2", "ventures");
	var btnSet6 = new Array("incubator", "academic_resources");
	var btnSet7 = new Array("straight_talk3", "ventures2");
	var btnSet8 = new Array("straight_talk", "ventures2");
	var btnSet9 = new Array("straight_talk4", "ventures2");
	var btnSet10 = new Array("straight_talk5", "ventures2");
	
	// fileName = "contact-us.html";
	
	switch(fileName) {
		
		// -----------------------------------------  About
		
		case "about.html":
		showHideBtns(btnSet1);
		break;
		
		case "mission.html":
		showHideBtns(btnSet1);
		break;
		
		case "staff.html":
		showHideBtns(btnSet1);
		break;
		
		case "operating-board.html":
		showHideBtns(btnSet1);
		break;
		
		case "senior-advisory-board.html":
		showHideBtns(btnSet1);
		break;
		
		// -----------------------------------------  Events
		
		case "events.html":
		showHideBtns(btnSet2);
		break;
		
		case "social-networking-groups.html":
		showHideBtns(btnSet2);
		break;
		
		case "calendar.html": // ??? did not know exact filename
		showHideBtns(btnSet2);
		break;
		
		case "student_groups.html": // ??? did not know exact filename
		showHideBtns(btnSet2);
		break;
		
		// -----------------------------------------  Ventures
		
		case "ventures.html":
		showHideBtns(btnSet3);
		break;
		
		case "student-startups-archive.html":
		showHideBtns(btnSet3);
		break;
		
		case "venture-registration.html":
		showHideBtns(btnSet3);
		break;
		
		// -----------------------------------------  Programs
		
		case "summer-fellowship.html":
		showHideBtns(btnSet10);
		break;
		
		case "summer-fellows.html":
		showHideBtns(btnSet7);
		break;
		
		case "summer-fellows-archive.html":
		showHideBtns(btnSet7);
		break;
		
		case "summer-speakers.html":
		showHideBtns(btnSet7);
		break;
		
		case "summer-speakers-archive.html":
		showHideBtns(btnSet7);
		break;
		
		case "summer-apply.html":
		showHideBtns(btnSet7);
		break;
		
		case "incubator.html":
		showHideBtns(btnSet9);
		break;
		
		case "incubator-apply.html":
		showHideBtns(btnSet9);
		break;
		
		case "mentor-program.html":
		showHideBtns(btnSet7);
		break;
		
		case "launch-pad-speakers.html":
		showHideBtns(btnSet7);
		break;
		
		// -----------------------------------------  Resources
		
		case "reference-room.html":
		showHideBtns(btnSet4);
		break;
		
		case "student-groups.html":
		showHideBtns(btnSet4);
		break;
		
		case "academic-resources.html":
		showHideBtns(btnSet4);
		break;
		
		case "startup-jobs.html":
		showHideBtns(btnSet4);
		break;
		
		case "startup-space.html":
		showHideBtns(btnSet4);
		break;
		
		case "contests.html":
		showHideBtns(btnSet4);
		break;
		
		case "partners.html":
		showHideBtns(btnSet4);
		break;
		
		case "alumni-entrepreneurs.html":
		showHideBtns(btnSet4);
		break;
		
		// -----------------------------------------  Media
		
		case "press.html":
		showHideBtns(btnSet5);
		break;
		
		case "ventures-press.html":
		showHideBtns(btnSet5);
		break;
		
		// -----------------------------------------  Blog
		
		case "blog.html":
		showHideBtns(btnSet6);
		break;
		
		// -----------------------------------------  Top Level Nav
		
		case "enewsletter-signup.html": // ??? buttons not specified in copy document
		showHideBtns(btnSet1);
		break;
		
		case "contact-us.html": // ??? buttons not specified in copy document
		showHideBtns(btnSet1);
		break;
		
		case "menu.html": // ??? buttons not specified in copy document
		showHideBtns(btnSet1);
		break;
		
	}
	
}

function showHideBtns(btnIds) {
	
	for(var i = 0; i < btns.length; i++) {
		
		var btn = btns[i];
		
		if(btn.id == btnIds[0] || btn.id == btnIds[1]) {
			
			if(i == btns.length - 1) {
					
				btn.className = "block_wrapper visible last";
					
			} else {
					
				btn.className = "block_wrapper visible";
					
			}
			
		} else {
				
			btn.className = "hidden";
				
		}
		
	}
	
}