<SCRIPT language=javascript type=text/JavaScript>
//改变图片大小
function resizepic(thispic)
...{
if(thispic.width>700) thispic.width=700;
}
//无级缩放图片大小
function bbimg(o)
...{
 var zoom=parseInt(o.style.zoom, 10)||100;
  zoom+=event.wheelDelta/12;
  if (zoom>0) o.style.zoom=zoom+'%';
}
//双击鼠标滚动屏幕的代码
var currentpos,timer;
function initialize()
...{
timer=setInterval ("scrollwindow ()",30);
}
function sc()
...{
clearInterval(timer);
}
function scrollwindow()
...{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos !=document.body.scrollTop)
sc();
}
document.onmousedown=sc
document.ondblclick=initialize

//更改字体大小
var status0='';
var curfontsize=10;
var curlineheight=18;
function fontZoomA()...{
  if(curfontsize>8)...{
    document.getElementById('fontzoom').style.fontSize=(--curfontsize)+'pt';
    document.getElementById('fontzoom').style.lineHeight=(--curlineheight)+'pt';
  }
}
function fontZoomB()...{
  if(curfontsize<64)...{
    document.getElementById('fontzoom').style.fontSize=(++curfontsize)+'pt';
    document.getElementById('fontzoom').style.lineHeight=(++curlineheight)+'pt';
  }
}
</SCRIPT>
http://blog.csdn.net/ye728/archive/2007/01/29/1497444.aspx