function switchTab(selected) {
	
    if(document.getElementById) {
        var aTab1    = document.getElementById("tab1");
        var aTab2    = document.getElementById("tab2");
	  var aTab3    = document.getElementById("tab3");
	  var aTab4    = document.getElementById("tab4");
        var aTabImg1 = document.getElementById("tabImg1");
        var aTabImg2 = document.getElementById("tabImg2");
	  var aTabImg3 = document.getElementById("tabImg3");
	  var aTabImg4 = document.getElementById("tabImg4");

        switch(selected) {
            case 1:
                aTab1.style.backgroundColor = "#666666";
                aTab2.style.backgroundColor = "#999999";
		   aTab3.style.backgroundColor = "#999999";
		   aTab4.style.backgroundColor = "#999999";
                aTabImg1.src = "/images/home/tab/tab_dk_lt.gif";
                aTabImg2.src = "/images/home/tab/tab_lt_lt.gif";
                aTabImg3.src = "/images/home/tab/tab_lt_lt.gif";
		   aTabImg4.src = "/images/home/tab/tab_lt.gif";
		   swapTabs(1);
                break;
            case 2:
                aTab1.style.backgroundColor = "#999999";
                aTab2.style.backgroundColor = "#666666";
		   aTab3.style.backgroundColor = "#999999";
		   aTab4.style.backgroundColor = "#999999";
                aTabImg1.src = "/images/home/tab/tab_lt_dk.gif";
                aTabImg2.src = "/images/home/tab/tab_dk_lt.gif";
		   aTabImg3.src = "/images/home/tab/tab_lt_lt.gif";
		   aTabImg4.src = "/images/home/tab/tab_lt.gif";
		   swapTabs(2);
                break;
		case 3:
                aTab1.style.backgroundColor = "#999999";
		   aTab2.style.backgroundColor = "#999999";
                aTab3.style.backgroundColor = "#666666";
                aTab4.style.backgroundColor = "#999999";
                aTabImg1.src = "/images/home/tab/tab_lt_lt.gif";
		   aTabImg2.src = "/images/home/tab/tab_lt_dk.gif";
		   aTabImg3.src = "/images/home/tab/tab_dk_lt.gif";
                aTabImg4.src = "/images/home/tab/tab_lt.gif";
		   swapTabs(3);
                break;
		case 4:
                aTab1.style.backgroundColor = "#999999";
		   aTab2.style.backgroundColor = "#999999";
                aTab3.style.backgroundColor = "#999999";
                aTab4.style.backgroundColor = "#666666";
                aTabImg1.src = "/images/home/tab/tab_lt_lt.gif";
                aTabImg2.src = "/images/home/tab/tab_lt_lt.gif";
		   aTabImg3.src = "/images/home/tab/tab_lt_dk.gif";
                aTabImg4.src = "/images/home/tab/tab_dk.gif";
		   swapTabs(4);
                break;
            default:
		   aTab1.style.backgroundColor = "#666666";
                aTab2.style.backgroundColor = "#999999";
		   aTab3.style.backgroundColor = "#999999";
		   aTab4.style.backgroundColor = "#999999";
                aTabImg1.src = "/images/home/tab/tab_dk_lt.gif";
                aTabImg2.src = "/images/home/tab/tab_lt_lt.gif";
                aTabImg3.src = "/images/home/tab/tab_lt_lt.gif";
		   aTabImg4.src = "/images/home/tab/tab_lt.gif";
		   swapTabs(1);
		   break;
        }
    }
}


function swapTabs(id) {
  var itemCount = 4;

  for (var i=1;i<=itemCount;i++) {
	var currentItem = document.getElementById("block"+i);
	
    if (currentItem != null) { 
	  if (i == id) {
		currentItem.style.display = 'block';
	  } else {
	    currentItem.style.display = 'none'; 
	  }
	}
  }
}