// 焦点图片切换
var nn;
nn=3;
setTimeout('change_img()',5000);

function change_img(){
	if(nn>3) nn=1
	setTimeout('setFocus1('+nn+')',5000);
	nn++;
	tt=setTimeout('change_img()',5000);
	}

function setFocus1(i)
	{selectLayer1(i);}

function selectLayer1(i)
	{switch(i)
	{
	case 1:
	document.getElementById("focusPic1").style.display="block";
	document.getElementById("focusPic2").style.display="none";
	document.getElementById("focusPic3").style.display="none";
	break;
	case 2:
	document.getElementById("focusPic1").style.display="none";
	document.getElementById("focusPic2").style.display="block";
	document.getElementById("focusPic3").style.display="none";
	break;
	case 3:
	document.getElementById("focusPic1").style.display="none";
	document.getElementById("focusPic2").style.display="none";
	document.getElementById("focusPic3").style.display="block";
	break;
	}
}

// 字体大小
function doZoom(size)
{ document.getElementById('zoom').style.fontSize=size + 'px';
}