//显示日期
function getCurrentDate()
{
	var d=new Date();
	var str="";
	str="今天是"+d.getYear()+"年"+(d.getMonth()+1)+"月"+d.getDate()+"日";
	
	return str;
}
//首页，选择文件概览块
function getFile(No){
 var i=0;
 var Stra="a.gif",Strb="b.gif";
 var filepieces = document.getElementsByName("filepiece");
 var filebuttons= document.getElementsByName("filebutton");
 for(i=0;i<filepieces.length;i++){
	filepieces[i].style.display="none";
	filebuttons[i].src=filebuttons[i].src.substr(0,filebuttons[i].src.length-5)+Stra;
	}
 filepieces[No-1].style.display="block";
 filebuttons[No-1].src=filebuttons[No-1].src.substr(0,filebuttons[No-1].src.length-5)+Strb;
}
//首页，选择网站导航概览块
function getLink(No){
 var i=0;
 var Stra="a.gif",Strb="b.gif";
 var linkpieces = document.getElementsByName("linkpiece");
 var linkbuttons= document.getElementsByName("linkbutton");
 for(i=0;i<linkpieces.length;i++){
	linkpieces[i].style.display="none";
	linkbuttons[i].src=linkbuttons[i].src.substr(0,linkbuttons[i].src.length-5)+Stra;
	}
 linkpieces[No-1].style.display="block";
 linkbuttons[No-1].src=linkbuttons[No-1].src.substr(0,linkbuttons[No-1].src.length-5)+Strb;
}