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function loadImg(src,width,height,callback,parms)
{
        var imgElem = new Image();
        imgElem.style.display = "none";
        imgElem.onload = function (){
            var loadWidth = parseFloat(imgElem.width), loadHeight = parseFloat(imgElem.height);
            var zoomWidth = loadWidth, zoomHeight = loadHeight;
            if(width && height && (loadWidth>width || loadHeight>height) )
            {
                if(Math.abs( width-loadWidth) <  Math.abs( height-loadHeight) )
                {
                    //宽度不变，等比缩放高度。
                    zoomWidth = width;
                    zoomHeight = (width*loadHeight)/loadWidth;
                    //高度大于需要高度，继续宽度缩放
                    if (zoomHeight > height)
                    {
                        zoomWidth = width*height/zoomHeight;
                        zoomHeight =  height;
                    }
                }else
                {
                    zoomHeight = height;
                    zoomWidth = (height*loadWidth)/loadHeight;
                    if (zoomWidth>width)
                    {
                        zoomHeight = width*height/zoomWidth;
                        zoomWidth =  width;
                    }
                }
            }
            if (callback) callback(src,zoomWidth,zoomHeight,parms);
            setTimeout(function (){
                imgElem.parentNode.removeChild(imgElem);
                imgElem = null;
            },0);
        };
        imgElem.src = src;
        imgElem.onabort = function (){ imgElem.src = imgElem.src; };
        //imgElem.onreadystatechange=function(){ if (imgElem.readyState=="complete") {} }
        document.body.insertBefore(imgElem,document.body.childNodes[0]);
}