text: function extend(num){
  	
  	if(num==1)
  	{
  		var obj = document.getElementById('first');
  		obj.style.display = "block";
  	}
  	else if(num==2)
  	{
  		var obj = document.getElementById('second');
  		obj.style.display = "block";
  	}
  	else if(num==3)
  	{
  		var obj = document.getElementById('third');
  		obj.style.display = "block";
  	}
  	else if(num==4)
  	{
  		var obj = document.getElementById('fourth');
  		obj.style.display = "block";
  	}
  	else if(num==5)
  	{
  		var obj = document.getElementById('fiveth');
  		obj.style.display = "block";
  	}
  	else if(num==6){
  		var obj = document.getElementById('sixth');
  		obj.style.display = "block";
  	}
  	else if(num==7){
          var obj = document.getElementById('seven');
          obj.style.display = "block";
      }
      else{
      	var obj = document.getElementById("eighth");
      	obj.style.display = "block"
      }
  }
  
  function out(num){
  	if(num==1)
  	{
  		var obj = document.getElementById('first');
  		obj.style.display = "none";
  	}
  	else if(num==2)
  	{
  		var obj = document.getElementById('second');
  		obj.style.display = "none";
  	}
  	else if(num==3)
  	{
  		var obj = document.getElementById('third');
  		obj.style.display = "none";
  	}
  	else if(num==4)
  	{
  		var obj = document.getElementById('fourth');
  		obj.style.display = "none";
  	}
  	else if(num==5)
  	{
  		var obj = document.getElementById('fifth');
  		obj.style.display = "none";
  	}
  	else if(num==6)
  	{
  		var obj = document.getElementById('sixth');
  		obj.style.display = "none";
  	}else if(num==7){
  		var obj = document.getElementById('seven');
  		obj.style.display = "none";
  	}else if(num==8){
  		var obj = document.getElementById('eighth');
  		obj.style.display = "none";
  	}
  }
  
  