function showtr(dongxi)
{
	if (dongxi == "kk1")
	{
	document.getElementById("kk1").style.display="";
	document.getElementById("kk2").style.display="none";
	document.getElementById("kk3").style.display="none";
	document.getElementById("kk4").style.display="none";
	}
	
	if (dongxi == "kk2")
	{
	document.getElementById("kk2").style.display="";
	document.getElementById("kk1").style.display="none";
	document.getElementById("kk3").style.display="none";
	document.getElementById("kk4").style.display="none";
	}	
	
	if (dongxi == "kk3")
	{
	document.getElementById("kk3").style.display="";
	document.getElementById("kk1").style.display="none";
	document.getElementById("kk2").style.display="none";
	document.getElementById("kk4").style.display="none";
	}	

	
	if (dongxi == "kk4")
	{
	document.getElementById("kk4").style.display="";
	document.getElementById("kk1").style.display="none";
	document.getElementById("kk2").style.display="none";
	document.getElementById("kk3").style.display="none";
	}	
}