$(document).ready(function(){
function changeSource1()
  {
  document.getElementById("content4").src="8.html"
  document.getElementById("content4").height="324"
    document.getElementById("e1").innerHTML="<b>Advanced Test</b>";
  document.getElementById("e2").innerHTML="Novice Test";
  document.getElementById("e3").innerHTML="Questions: Tier I";
  document.getElementById("e4").innerHTML="Questions: Tier II";
  document.getElementById("e5").innerHTML="Questions: Tier III";
  }
 function changeSource2()
  {
  document.getElementById("content4").src="24.html"
  document.getElementById("content4").height="324"
    document.getElementById("e1").innerHTML="Advanced Test";
  document.getElementById("e2").innerHTML="<b>Novice Test</b>";
  document.getElementById("e3").innerHTML="Questions: Tier I";
  document.getElementById("e4").innerHTML="Questions: Tier II";
  document.getElementById("e5").innerHTML="Questions: Tier III";
  } 
  function changeSource3()
  {
  document.getElementById("content4").src="ecntier1.htm"
  document.getElementById("content4").height="870"
    document.getElementById("e1").innerHTML="Advanced Test";
  document.getElementById("e2").innerHTML="Novice Test";
  document.getElementById("e3").innerHTML="<b>Questions: Tier I</b>";
  document.getElementById("e4").innerHTML="Questions: Tier II";
  document.getElementById("e5").innerHTML="Questions: Tier III";
  }
  function changeSource4()
  {
  document.getElementById("content4").src="ecntier2.htm"
  document.getElementById("content4").height="1740"
     document.getElementById("e1").innerHTML="Advanced Test";
  document.getElementById("e2").innerHTML="Novice Test";
  document.getElementById("e3").innerHTML="Questions: Tier I";
  document.getElementById("e4").innerHTML="<b>Questions: Tier II</b>";
  document.getElementById("e5").innerHTML="Questions: Tier III";
  }
  function changeSource5()
  {
  document.getElementById("content4").src="ecntier3.htm"
  document.getElementById("content4").height="1160"
    document.getElementById("e1").innerHTML="Advanced Test";
  document.getElementById("e2").innerHTML="Novice Test";
  document.getElementById("e3").innerHTML="Questions: Tier I";
  document.getElementById("e4").innerHTML="Questions: Tier II";
  document.getElementById("e5").innerHTML="<b>Questions: Tier III</b>";
  }

	var sections = $("#menu4 li");
	var loading = $("#loading4");
	var content = $("#content4");
	
	sections.click(function(){

		switch(this.id){
			case "e1":
				content.slideUp();
				onclick=changeSource1();
				content.slideDown();
				break;
			case "e2":
				content.slideUp();
				onclick=changeSource2();
				content.slideDown();
				break;
			case "e3":
				content.slideUp();
				onclick=changeSource3();
				content.slideDown();
				break;
			case "e4":
				content.slideUp();
				onclick=changeSource4();
				content.slideDown();
				break;
			case "e5":
				content.slideUp();
				onclick=changeSource5();
				content.slideDown();
				break;
			default:
				break;
		}
	});

	
});