bhnum=6000;  //切换时间
bhheight=5;  //高度设置
bhtime=20;	 //
var lx="upf";
function kk(){
nownum=Math.abs(lj1.offsetTop);
if(nownum>220&&(lx=="upf"||lx=="")){
lx="downf";

}
if(nownum<75&&lx=="downf"){
lx="upf";

}
if(lx=="upf"){
yidong('-5',lj1.offsetTop)
}
else{
yidong('+5',lj1.offsetTop)
}
setTimeout("kk()",bhnum)
}

function yidong1(str,num1){
knum=Math.abs(lj1.offsetTop-num1);
evalstr="lj1.style.top=lj1.offsetTop"+str;
if(knum<75){
eval(evalstr);
yt=setTimeout("yidong('"+str+"',"+num1+","+num2+")",bhtime)
}
alert(str);
}

function yidong(str,num1){
evalstr="lj1.style.top=lj1.offsetTop"+str;
knum=Math.abs(lj1.offsetTop-num1);
if(knum<75){
eval(evalstr);
yt=setTimeout("yidong('"+str+"',"+num1+")",bhtime)
}

if(knum>=75){
clearTimeout(yt)
}
}