Code implemented in javascript that is fully compatible with mouse scroll wheel zooming of images_javascript skills

/*!
*author: Code implemented in javascript that is fully compatible with mouse scroll wheel zooming of images_javascript skills
*blog:http://www.cnblogs.com/Code implemented in javascript that is fully compatible with mouse scroll wheel zooming of images_javascript skills
*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){//First Each parameter specifies the image that can be zoomed, min specifies the minimum zoom size, 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(){//Put it in onload, otherwise it will not be in ie There will be an error in calculating the image size
zooming.add(document.getElementById("testimg1"));
}