var xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async="false";
xmlDoc.load("content.xml");
function GetCourseInfo(tagName)
{
    return document.write(xmlDoc.getElementsByTagName(tagName)[0].firstChild.data);
}

function switchxbTag(xbtag,xbcontent,xbk)
{
    for(i=1; i <3; i++) 
    {
        if (i==xbk)
        {
            document.getElementById(xbtag+i).className="xbl1";document.getElementById(xbcontent+i).className="xbh_lsit";
        }
        else
        {
            document.getElementById(xbtag+i).className="xbl2";document.getElementById(xbcontent+i).className="xbh_lsit_none";
        }
    }
}
  
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_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_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];}
}

function ChangeBanShu()
{
	if(tr_top.style.display!='none')
	{
		tr_top.style.display='none';
		tr_footer.style.display='none';
		td_Left.style.display='none'; 
		document.getElementById('RightFrame').height='772px';
		document.getElementById('RightFrame').width='934px';
		ImgBS.src='images/bssx_1.jpg';
		ImgBS.alt='板书缩小';
	}
	else
	{
		tr_top.style.display='';
		tr_footer.style.display='';
		td_Left.style.display='';
		document.getElementById('RightFrame').height='650px;';
		document.getElementById('RightFrame').width='100%';
		ImgBS.src='images/bsfd_1.jpg';
		ImgBS.alt='板书放大';
	} 
}

function ChangePic()
{
	if(tr_top.style.display!='none')
	{
		document.getElementById('ImgBS').src='images/bsfd_1.jpg';
	}
	else
	{
		document.getElementById('ImgBS').src='images/bssx_1.jpg';
	}
}