function showlayer(id,index)
{
	eval("document.getElementById('tab_"+id+"').className='active'");
	eval("document.getElementById('tab_"+index+"').className='normal'");
	eval("document.getElementById('layer_"+id+"').style.display='block'");
	eval("document.getElementById('layer_"+index+"').style.display='none'");
}
function _showlayer(id,num)
{
	for (i=1;i<8;i++)
	{
		eval("document.getElementById('tab"+num+"_"+i+"').className='normal'");
		eval("document.getElementById('layer"+num+"_"+i+"').style.display='none'");
	}
	eval("document.getElementById('tab"+num+"_"+id+"').className='active'");
	eval("document.getElementById('layer"+num+"_"+id+"').style.display='block'");
}