//图片按比例缩放
//调用：<img src="图片" onload="javascript:DrawImage(this,100,120)">
//创建者：owen
//创建时间：2008-03-14 13:46
//修改时间：
//版本： 1.0
var flag = false;
function DrawImage(ImgD, Width, Height) {
    var image = new Image();
    var iwidth = Width; //定义允许图片宽度，当宽度大于这个值时等比例缩小
    var iheight = Height; //定义允许图片高度，当宽度大于这个值时等比例缩小
    image.src = ImgD.src;
    if (image.width > 0 && image.height > 0) {
        flag = true;
        if (image.width / image.height >= iwidth / iheight) {
            if (image.width > iwidth) {
                ImgD.width = iwidth;
                ImgD.height = (image.height * iwidth) / image.width;
            } else {
                ImgD.width = image.width;
                ImgD.height = image.height;
            }
            //ImgD.alt=image.width+"×"+image.height;
        }
        else {
            if (image.height > iheight) {
                ImgD.height = iheight;
                ImgD.width = (image.width * iheight) / image.height;
            } else {
                ImgD.width = image.width;
                ImgD.height = image.height;
            }
            //ImgD.alt=image.width+"×"+image.height;
        }
    }
}
function imgError(o) {
    o.onerror = null;
    o.src = "http://file.141cn.com/CNIM/DefaultPhoto/def_b_xx.gif";
}