function on_click(obj)
	{
		var tabItems = new Array("item1","item2","item3","item4","item5","item6","item7","item8","item9");
		for(var i=0; i<tabItems.length;i++)
		{
			if (tabItems[i] == obj)
			{
				on_click_display(obj,'block');
				document.getElementById(obj).className='adark';
			}
			else
			{
				on_click_display(tabItems[i],'none');
				document.getElementById(tabItems[i]).className='normal';
			}
		}
   }
function switch_display(obj,value)
	{
		document.getElementById(obj).style.display=value;
	}		
function on_click_display(obj,display_type)
	{
		obj1=obj+'_1';
		switch_display(obj1,display_type);
	}