//-----------------------------------------------
//
//	控制图片大小,按比例缩放,
//	修改 x_ 与 y_ 来更改最大尺寸,
//	应用方法:
//	<img src="image.gif" onload="thumbImg(this);" style="width:300px; height:300px;" />
//
//-----------------------------------------------


function thumbImg(oImg){
	var x_ = 300, y_ = 0;		//最大尺寸;
	var w_, h_;
	
	var thImg = new Image();
	
	thImg.onload = function()
	{
		w_ = thImg.width;
		
		h_ = thImg.height;
		
		//调整大小;
		if(w_ > x_){
			h_ = h_ * x_ / w_;
			w_ = x_;
		}
		if(h_ > y_){
			w_ = w_ * y_ / h_;
			h_ = y_;
		}
		
		with(oImg){
			width = w_;
			height =h_;
			if(style.display == "none" || style.display == "hidden"){
				style.display = "";
			}
		}
	}
	
//	thImg.src = oImg.src;
}