// JavaScript Document
   var cid=1
   function checkout(ID)
   {
	   if (ID=="")
	   {
		  ID=cID  
		   
		}
      if (ID=="1")
	  {
	    document.getElementById("Layer1").style.display = ""; 
		document.getElementById("Layer2").style.display = "none";
		document.getElementById("Layer3").style.display = "none";
		document.getElementById("Layer4").style.display = "none";
		tab_1.className="tdwhite";
		tab_2.className="tdF5F5F5";
	
		tab_4.className="tdF5F5F5";
	  }
      if (ID=="2")
	  {
	    document.getElementById("Layer1").style.display = "none"; 
		document.getElementById("Layer2").style.display = "";
		document.getElementById("Layer3").style.display = "none";
		document.getElementById("Layer4").style.display = "none";
		tab_1.className="tdF5F5F51";
		tab_2.className="tdwhite2";

		tab_4.className="tdF5F5F5";
	  }
      if (ID=="3")
	  {
	    document.getElementById("Layer1").style.display = "none"; 
		document.getElementById("Layer2").style.display = "none";
		document.getElementById("Layer3").style.display = "";
		document.getElementById("Layer4").style.display = "none";
		tab_1.className="tdF5F5F51";
		tab_2.className="tdF5F5F5";
	
		tab_4.className="tdF5F5F5";
	  }

	  if (ID=="4")
	  {
	    document.getElementById("Layer1").style.display = "none"; 
		document.getElementById("Layer2").style.display = "none";
		document.getElementById("Layer3").style.display = "none";
		document.getElementById("Layer4").style.display = "";
		tab_1.className="tdF5F5F51";
		tab_2.className="tdF5F5F5";
	
		tab_4.className="tdwhite2";
	  }
   
   }