// JScript 文件
//按比例伸缩图片

//jack 2008-09-19
function AutoResizeImage(maxWidth,maxHeight,objImg)
{
    if (typeof(objImg)=='string')
    {
        objImg = $(objImg);
    }
    var img = new Image();
    img.onload = function(){
    var hRatio;
    var wRatio;
    var Ratio = 1;
    var w = img.width;
    var h = img.height;
    wRatio = maxWidth / w;
    hRatio = maxHeight / h;
    wRatio = wRatio>1?1:wRatio;
    hRatio = hRatio>1?1:hRatio;
    if (maxWidth ==0 && maxHeight==0)
    {
        Ratio = 1;
    }
    else if (maxWidth==0)
    {//
        if (hRatio<1) Ratio = hRatio;
    }
    else if (maxHeight==0)
    {
        if (wRatio<1) Ratio = wRatio;
    }
    else 
    {
        Ratio = (wRatio<=hRatio?wRatio:hRatio);
    }
    if (Ratio<1)
    {
        w = w * Ratio;
        h = h * Ratio;
    }
    objImg.height = h;
    objImg.width = w;
    this.onload = function(){}
    }
    img.src = objImg.src;
}