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 aTab5    = document.getElementById("tab5");
	  	var aTab6    = document.getElementById("tab6");
        

        switch(selected) {
            case 1:
                swapTabs(1);
                break;
        	
			case 2:
		   	swapTabs(2);
                break;
			
			case 3:
		   	swapTabs(3);
                break;
			
			case 4:
			swapTabs(4);
                break;
                
			case 5:
				swapTabs(5);
	                break;
	                
			case 6:
				swapTabs(6);
	                break;
	        
		   	default:
		   	swapTabs(1);
		  	
			break;
        }
    }
}


function swapTabs(id) {
	var itemCount = 7;

  	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'; 
	  		}			
		}
  	}
}