function shownav(id)
{

	for(var i=1; i<=12; i++)
	{
		var other = "nav"+i;		
		document.getElementById(other).style.display="none";
		}	
	var name = "nav"+id;
	document.getElementById(name).style.display="block";

	}
function showtab(id)
{

	for(var i=21; i<=23; i++)
	{
		var other = "tab"+i;		
		document.getElementById(other).style.display="none";
		document.getElementById(i).style.background="url(themes/default/cn/common/images/index_06.jpg) no-repeat right center";
		
		document.getElementById(i).style.color="#666";		
		}	
	var name = "tab"+id;
	document.getElementById(name).style.display="block";
	document.getElementById(id).style.background="url(themes/default/cn/common/images/index_15.jpg) no-repeat";
	document.getElementById(id).style.color="#FFF";
	}