var lf=new Array;
var df=new Array;
var tp=new Array;
var ox=new Array;
var oy=new Array;
var tn=4;
var nn,getwid,getheight;

for(nn=0;nn<tn;nn++)
{
//df[nn]=10;
lf[nn]=10;
tp[nn]=10;
ox[nn]=Math.random()*10;
oy[nn]=Math.random()*10;
}

defaultStatus="请务必使用 1024*768, IE 5.x 或 Netscape Communicator 6.x 浏览"

function runtdfn() 
{
if (navigator.appName=="Netscape") {
    nav="ns4";
    doc="document.";
    sty="";
    getwid=window.innerWidth-50;
    getheight=window.innerHeight-50;
    } 
else
    {
    nav="ie4";
    doc="document.all.";
    sty=".style";
    getwid=200;
    getheight=150;
    };

for(nn=0;nn<tn;nn++)
{
	df[nn]=eval(doc+"wqyy"+nn+sty);
	df[nn].left=lf[nn];
	df[nn].top=tp[nn];
}

showtdfn();           
movetdfn();
}

function showtdfn()
{
	for(nn=0;nn<tn;nn++)      
	 df[nn].visibility="visible";
}

function movetdfn()
{ 
	for(nn=0;nn<tn;nn++) {
		if (parseInt(df[nn].left)>(getwid-10)) 
		 { ox[nn]=0-Math.round(Math.random()*10);
		 } 
        if (parseInt(df[nn].left)<10)
         { ox[nn]=Math.round(Math.random()*10);
         }  
        if(parseInt(df[nn].top)>(getheight-10))
         { oy[nn]=0-Math.round(Math.random()*10);  
         }  
        if(parseInt(df[nn].top)<10)
		 {oy[nn]=Math.round(Math.random()*10);  
         }
        df[nn].left=parseInt(df[nn].left)+ox[nn];
        df[nn].top=parseInt(df[nn].top)+oy[nn];
	} 
setTimeout("movetdfn()",100);
}