function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

var tabsObj,Act,Tab,Box,i,n;

function topics(num) {

	tabsObj = document.getElementById('tabs');
	n = tabsObj.getElementsByTagName('li').length;

	Act = 'tab' + num;

	for(i=1; i<n+1; i++){

		Tab = 'tab' + i;
		Box = 'topic' + i;

		if(Act == Tab) {

			//IE8、Firefox 等
			if(i == 1) { document.getElementById(Tab).setAttribute('class','first active'); }
			else if(i == n) { document.getElementById(Tab).setAttribute('class','last active'); }
			else { document.getElementById(Tab).setAttribute('class','active'); }

			//IE7以下
			if(i == 1) { document.getElementById(Tab).setAttribute('className','first active'); }
			else if(i == n) { document.getElementById(Tab).setAttribute('className','last active'); }
			else { document.getElementById(Tab).setAttribute('className','active'); }
			
			document.getElementById(Box).style.display = 'block';
			document.getElementById(Box).style.paddingTop = '0';
			document.getElementById(Box).style.borderBottom = 'none';

		}
		else {

			//IE8、Firefox 等
			if(i == 1) { document.getElementById(Tab).setAttribute('class','first passive'); }
			else if(i == n) { document.getElementById(Tab).setAttribute('class','last passive'); }
			else { document.getElementById(Tab).setAttribute('class','passive'); }

			//IE7以下
			if(i == 1) { document.getElementById(Tab).setAttribute('className','first passive'); }
			else if(i == n) { document.getElementById(Tab).setAttribute('className','last passive'); }
			else { document.getElementById(Tab).setAttribute('className','passive'); }

			document.getElementById(Box).style.display = 'none';

		}

	}

}