//图片等比例缩放 
var FitWidth = 300; //图片宽度 
var FitHeight = 300; //图片高度 
function ResizePic(ImgTag) {

    var isIE = !!window.ActiveXObject;
    var isIE6 = isIE && !window.XMLHttpRequest;
    //var isIE8 = isIE && !!document.documentMode;
    //var isIE7 = isIE && !isIE6 && !isIE8;
    if (isIE) {
        if (isIE6) {
            var image = new Image();
            image.src = ImgTag.src;
            if (image.width > 0 && image.height > 0) {
                if (image.width / image.height >= FitWidth / FitHeight) {
                    if (image.width > FitWidth) {
                        ImgTag.width = FitWidth;
                        ImgTag.height = (image.height * FitWidth) / image.width;
                    }
                    else {
                        ImgTag.width = image.width;
                        ImgTag.height = image.height;
                    }
                }
                else {
                    if (image.height > FitHeight) {
                        ImgTag.height = FitHeight;
                        ImgTag.width = (image.width * FitHeight) / image.height;
                    }
                    else {
                        ImgTag.width = image.width;
                        ImgTag.height = image.height;
                    }
                }
            }
        }
    }
}