function showbg1(id)
{
	document.getElementById("bg1_1").className="showbg1_2";
	document.getElementById("bg1_2").className="showbg1_2";
	document.getElementById("bg1_3").className="showbg1_2";
	document.getElementById("bg1_"+id).className="showbg1_1";
	
	document.getElementById("div1_1").style.display='none';
	document.getElementById("div1_2").style.display='none';
	document.getElementById("div1_3").style.display='none';
	document.getElementById("div1_"+id).style.display='block';	
}
function showbg2(id)
{
	document.getElementById("bg2_1").className="showbg2_1";
	document.getElementById("bg2_2").className="showbg2_1";
	document.getElementById("bg2_"+id).className="showbg2_2";
	
	document.getElementById("div2_1").style.display='none';
	document.getElementById("div2_2").style.display='none';
	document.getElementById("div2_"+id).style.display='block';
}
function showbg3(id)
{
	document.getElementById("bg3_1").className="showbg3_2";
	document.getElementById("bg3_2").className="showbg3_2";
	document.getElementById("bg3_"+id).className="showbg3_1";
	
	document.getElementById("div3_1").style.display='none';
	document.getElementById("div3_2").style.display='none';
	document.getElementById("div3_"+id).style.display='block';	
}