//图片等比例缩放
function DrawImage(ImgD,FitWidth){
	var image=new Image();
	image.src=ImgD.src;
	if(image.width>0 && image.height>0){
		if(image.width>=FitWidth){
			ImgD.width=FitWidth;
			ImgD.height=(image.height)*FitWidth/image.width;
		}
		if(image.width<FitWidth){
		}
	}
}
function ChangeImg(id){
	var transition = id;//图片切换时渐变方式 0－－22
	var tranSpeed = 1;//图片切换渐变速度。 值越小速度越快

	var oImg = $v("bigImage");
	if(!oImg) return;
	if (document.all){
		oImg.filters.revealTrans.apply();
	}
	if (document.all){
		if(!this.tranRandom) oImg.filters.revealTrans.transition = transition;
		oImg.style.visibility = "";
		oImg.style.display ="block";
		oImg.filters.revealTrans.play(tranSpeed);
	}else{
		oImg.style.visibility = "";
	}
}

function $v(id){
	return document.getElementById(id);
}