在以下代码中怎样设置图片链接页面的大小.???



<script>
//可设置漂浮图片是否为FLASH以及显示大小

var brOK=false;
var mie=false;
var vmin=2;
var vmax=5;
var vr=1;
var timer1;
var chinazads;
var isflash=0; //是否为FLASH文件的漂浮 1=是 0=否
var pic="image/2.gif"; //图片的地址
var alt="www.163.com"; //鼠标放在图片上时显示的提示文字
var url="http://www.163.com"; //图片链接的地址
var flashurl="/AI/EQIFA.swf"; //FLASH文件的路径
var Wimg=400; //图像的宽度
var Himg=240; //图像的高度
function movechip(chipname)
{
if(brOK)
{
eval("chip="+chipname);
if(!mie)
{
pageX=window.pageXOffset;
pageW=window.innerWidth;
pageY=window.pageYOffset;
pageH=window.innerHeight;
}
else
{
pageX=window.document.body.scrollLeft-100; //100数值修改，应该图片的大小加上浏览器边框，这样就能折回
pageW=window.document.body.offsetWidth-8;
pageY=window.document.body.scrollTop;
pageH=window.document.body.offsetHeight;
}
chip.xx=chip.xx+chip.vx;
chip.yy=chip.yy+chip.vy;
chip.vx+=vr*(Math.random()-0.5);
chip.vy+=vr*(Math.random()-0.5);
if(chip.vx>(vmax+vmin)) chip.vx=(vmax+vmin)*2-chip.vx;
if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
if(chip.vy>(vmax+vmin)) chip.vy=(vmax+vmin)*2-chip.vy;
if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;
if(chip.xx<=pageX)
{
chip.xx=pageX;
chip.vx=vmin+vmax*Math.random();
}
if(chip.xx>=pageX+pageW-chip.w)
{
chip.xx=pageX+pageW-chip.w;
chip.vx=-vmin-vmax*Math.random();
}
if(chip.xx>=680)
{
chip.xx=chip.xx-20;
chip.vx=-vmin-vmax*Math.random();
}
if(chip.yy<=pageY)
{
chip.yy=pageY;
chip.vy=vmin+vmax*Math.random();
}
if(chip.yy>=pageY+pageH-chip.h)
{
chip.yy=pageY+pageH-chip.h;
chip.vy=-vmin-vmax*Math.random();
}
if(!mie)
{
eval('document.'+chip.named+'.top ='+chip.yy);
eval('document.'+chip.named+'.left='+chip.xx);
}
else
{
eval('document.all.'+chip.named+'.style.pixelLeft='+chip.xx);
eval('document.all.'+chip.named+'.style.pixelTop ='+chip.yy);
}
chip.timer1=setTimeout("movechip('"+chip.named+"')",80);
}
}

function stopme(chipname)
{
if(brOK)
{
eval("chip="+chipname);
if(chip.timer1!=null)
{
clearTimeout(chip.timer1)
}
}
}

function chinazads()
{
if(navigator.appName.indexOf("Internet Explorer")!=-1)
{
if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();mie=true;
}
if(navigator.appName.indexOf("Netscape")!=-1)
{
if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
}
chinazads.named="chinazads";
chinazads.vx=vmin+vmax*Math.random();
chinazads.vy=vmin+vmax*Math.random();
chinazads.w=1;
chinazads.h=1;
chinazads.xx=0;
chinazads.yy=0;
chinazads.timer1=null;
movechip("chinazads");
}

document.write('<div id="chinazads" style="height:49px;left:178px;position:absolute;top:1237px;width:70px; z-index:1000">');
if (isflash>0)
{
document.write("<EMBED src='" + flashurl + "' quality=high WIDTH='" + Wimg + "' HEIGHT='" + Himg + "' TYPE='application/x-shockwave-flash'></EMBED>");
}
else
{
document.write("<a href='" + url + "' target=_blank onmouseover=stopme('chinazads'); onmouseout=movechip('chinazads');>");
document.write("<img src='" + pic + "' alt='" + alt + "' border=0 width='" + Wimg + "' height='" + Himg + "'></a>");
}
document.write("</div>");
chinazads();
</script>