function displayDiv(tab)
{
   if(tab=='header1')
   {
      document.getElementById("div1").style.display = "block";
      document.getElementById("div2").style.display = "none";
      document.getElementById("div3").style.display = "none";
      document.getElementById("div4").style.display = "none";
      document.getElementById("div5").style.display = "none";
      document.getElementById("header1").src="/PublishingImages/NTU Public Portal/rb-student.jpg";
      document.getElementById("header2").src="/PublishingImages/NTU Public Portal/rb-parents2.jpg";
      document.getElementById("header3").src="/PublishingImages/NTU Public Portal/rb-industry2.jpg";
      document.getElementById("header4").src="/PublishingImages/NTU Public Portal/rb-alumni2.jpg";
      document.getElementById("header5").src="/PublishingImages/NTU Public Portal/rb-media2.jpg";
      }
   else if(tab=='header2')
   {  document.getElementById("div1").style.display = "none";
      document.getElementById("div2").style.display = "block";
      document.getElementById("div3").style.display = "none";
      document.getElementById("div4").style.display = "none";
      document.getElementById("div5").style.display = "none";
      document.getElementById("header1").src="/PublishingImages/NTU Public Portal/rb-student2.jpg";
	  document.getElementById("header2").src="/PublishingImages/NTU Public Portal/rb-parents.jpg";
	  document.getElementById("header3").src="/PublishingImages/NTU Public Portal/rb-industry2.jpg";
	  document.getElementById("header4").src="/PublishingImages/NTU Public Portal/rb-alumni2.jpg";
      document.getElementById("header5").src="/PublishingImages/NTU Public Portal/rb-media2.jpg";
   }
   else if(tab=='header3')
   {  document.getElementById("div1").style.display = "none";
      document.getElementById("div2").style.display = "none";
      document.getElementById("div3").style.display = "block";
      document.getElementById("div4").style.display = "none";
      document.getElementById("div5").style.display = "none";
      document.getElementById("header1").src="/PublishingImages/NTU Public Portal/rb-student2.jpg";
	  document.getElementById("header2").src="/PublishingImages/NTU Public Portal/rb-parents2.jpg";
	  document.getElementById("header3").src="/PublishingImages/NTU Public Portal/rb-industry.jpg";
	  document.getElementById("header4").src="/PublishingImages/NTU Public Portal/rb-alumni2.jpg";
      document.getElementById("header5").src="/PublishingImages/NTU Public Portal/rb-media2.jpg";

    }
    else if(tab=='header4')
   {  document.getElementById("div1").style.display = "none";
	  document.getElementById("div2").style.display = "none";
	  document.getElementById("div3").style.display = "none";
	  document.getElementById("div4").style.display = "block";
      document.getElementById("div5").style.display = "none";
  	  document.getElementById("header1").src="/PublishingImages/NTU Public Portal/rb-student2.jpg";
	  document.getElementById("header2").src="/PublishingImages/NTU Public Portal/rb-parents2.jpg";
	  document.getElementById("header3").src="/PublishingImages/NTU Public Portal/rb-industry2.jpg";
	  document.getElementById("header4").src="/PublishingImages/NTU Public Portal/rb-alumni.jpg";
      document.getElementById("header5").src="/PublishingImages/NTU Public Portal/rb-media2.jpg";

    }
    else if(tab=='header5')
   {  document.getElementById("div1").style.display = "none";
	  document.getElementById("div2").style.display = "none";
	  document.getElementById("div3").style.display = "none";
	  document.getElementById("div4").style.display = "none";
      document.getElementById("div5").style.display = "block";
	  document.getElementById("header1").src="/PublishingImages/NTU Public Portal/rb-student2.jpg";
	  document.getElementById("header2").src="/PublishingImages/NTU Public Portal/rb-parents2.jpg";
	  document.getElementById("header3").src="/PublishingImages/NTU Public Portal/rb-industry2.jpg";
	  document.getElementById("header4").src="/PublishingImages/NTU Public Portal/rb-alumni2.jpg";
      document.getElementById("header5").src="/PublishingImages/NTU Public Portal/rb-media.jpg";

   }
  }