function lrn_ShowAppendix(_sParentNodeId)
{


	if(typeof(_sParentNodeId)!= "string" ||_sParentNodeId.length==0 )
	    return;
	 
	var nLinkLength=document.getElementById(_sParentNodeId).getElementsByTagName("a").length; 
	var aMyLinks=document.getElementById(_sParentNodeId).getElementsByTagName("a");
	var reg=/\.((pdf)|(doc)|(ppt)|(htm)|(avi)|(wav)|(wmv))\/*$/i;
		
	var oNewTextNode;
	var i=0,nDeletLinkNum=0;
	while(true)
	{
	    
		if(i>=document.getElementById(_sParentNodeId).getElementsByTagName("A").length)
		  break;
		if(aMyLinks[i].getAttribute("href").match(reg)==null)
		{ 
		
		   //aMyLinks[i].outerHTML="<font color='#990000'>本附件不显示!</font>";
		   //aMyLinks[i].style.display="none";	
		   //oNewTextNode=document.createTextNode("本附件不显示!");
		   //aMyLinks[i].parentElement.insertBefore(oNewTextNode,aMyLinks[i]);  
		    
           aMyLinks[i].parentElement.removeChild(aMyLinks[i]);
           nDeletLinkNum++;
		  //document.write("本附件不显示!");
		}
		else 
		{
		    i++;
		}
		
	
	}
	
	//document.write("nDeletLinkNum="+nDeletLinkNum+"<br>");
	//document.write("nLinkLength="+nLinkLength+"<br>");

	if(nDeletLinkNum==nLinkLength)
	  document.getElementById(_sParentNodeId).style.display="none";;

}