//图片自适应大小
function ResizeImage(obj, MaxW, MaxH)
{
    var imageObject;

    if (obj != null) imageObject = obj;
    else  return;
    var state=imageObject.readyState;
//	if(state!='complete') {
//        setTimeout(ResizeImage(obj,MaxW,MaxH),500);
//		return;
//    }
    var oldImage = new Image();
    oldImage.src = imageObject.src;
    var dW=oldImage.width; var dH=oldImage.height;
    if(dW>MaxW || dH>MaxH) {
        a=dW/MaxW; b=dH/MaxH;
        if(b>a) a=b;
        dW=dW/a; dH=dH/a;
    }
    if(dW > 0 && dH > 0) {
        imageObject.width=dW;
		imageObject.height=dH;
	}
}

//图片自适应大小(用户签名专用)
function ResizeImageUserAdage(obj)
{
    ResizeImage(obj,288,144);
}

function ResizeImageOld(obj,MaxW,MaxH){
	var oldH=0,oldW=0;
	var reH=0,reW=0;
	if (obj.width > MaxW){
		reW = MaxW / obj.width * obj.width;
		reH = MaxW / obj.width * obj.height;
		if (reH > MaxH){
		    reW = MaxH / reH * reW;
			reH = MaxH / reH * reH;
		}
	}else if (obj.height > MaxH){
		reH = MaxH / obj.height * obj.height;
		reW = MaxH / obj.height * obj.width;
	}
	obj.width = reW;
	obj.height = reH;
}