/*!
*author:sohighthesky
*blog:http://www.cnblogs.com/sohighthesky
*date:2010-2-4
*/
var zooming=function(e){
e=window.event ||e;
var o=this,data=e.wheelDelta || e.detail*40,zoom,size;
if(!+'\v1'){
zoom = parseInt(o.style.zoom) || 100;
zoom += data / 12;
if(zoom > zooming.min)
o.style.zoom = zoom + '%';
}else {
size=o.getAttribute("_zoomsize").split(",");
zoom=parseInt(o.getAttribute("_zoom")) ||100;
zoom+=data/12;
if(zoom>zooming.min){
o.setAttribute("_zoom",zoom);
o.style.width=size[0]*zoom/100+"px";
o.style.height=size[1]*zoom/100+"px";
}
}
};
zooming.add=function(obj,min){//第一个参数指定可以缩放的图片，min指定最小缩放的大小 ,default to 50
zooming.min=min || 50;
obj.onmousewheel=zooming;
if(/a/[-1]=='a')//if Firefox
obj.addEventListener("DOMMouseScroll",zooming,false);
if(-[1,]){//if not IE
obj.setAttribute("_zoomsize",obj.offsetWidth+","+obj.offsetHeight);
}
};

window.onload=function(){//放在onload中，否则非ie中会无法计算图片大小出错
zooming.add(document.getElementById("testimg1"));
}