//改变透明度参数：图片对象，透明度：1-100的值
function setAlpha(imgObj,opacityValue){
    imgObj.filters.alpha.opacity=parseInt(opacityValue);
    }
//图片的显示大小[以宽度来限制]
function DrawImageW(imgObj,widthValue){ 
    var image=new Image(); 
    image.src=imgObj.src; 
    if(image.width>0 && image.height>0){ 
        if(image.width>=widthValue){ 
            imgObj.width=widthValue; 
            imgObj.height=(image.height*widthValue)/image.width; 
        }else{ 
            imgObj.width=image.width; 
            imgObj.height=image.height; 
        }  
    } 
} 
//图片的显示大小[以高度来限制]
function DrawImageH(imgObj,heightValue){ 
    var image=new Image(); 
    image.src=imgObj.src; 
    if(image.width>0 && image.height>0){ 
        if(image.height>=heightValue){ 
            imgObj.height=heightValue; 
            imgObj.width=(image.width*heightValue)/image.height; 
        }else{ 
            imgObj.width=image.width; 
            imgObj.height=image.height; 
        }  
    } 
} 
//图片的显示大小[宽高同时限制]
function DrawImage(imgObj,widthValue,heightValue){ 
    var image=new Image(); 
    image.src=imgObj.src;
    if(image.width>0 && image.height>0){ 
        if(image.height>heightValue||image.width>widthValue){
            var h=0,w,wflg=false;
            if(image.height>heightValue)
                wflg=true;
            if(wflg){
                w=widthValue; 
                h=(image.height*widthValue)/image.width; 
                }
            if(h==0||h>heightValue){
                h=heightValue; 
                w=(image.width*heightValue)/image.height; 
                }
                //alert(w)
                //alert(h)
                imgObj.width=w; 
                imgObj.height=h; 
        }else{ 
            imgObj.width=image.width; 
            imgObj.height=image.height; 
        }  
    } 
} 
function zoomImg(imgObj){
    var zoom=parseInt(imgObj.style.zoom, 10)||100;zoom+=event.wheelDelta/12;
    if (zoom>0) imgObj.style.zoom=zoom+'%';
    return false;
}