function imgc()
{
	var fix_img_objs = document.getElementsByTagName("img")
	for(var i=0;i<fix_img_objs.length;i++)
	{
		var fix_img_obj = fix_img_objs[i];
		var max_height=fix_img_obj.max_height;
		//如果定义了 max_height 属性，就调整图片大小
		if(max_height!=null && max_height != "")
		{
			var max_height_int = parseInt(max_height);
			if(fix_img_obj.height>max_height_int)
			{
					var old_height =fix_img_obj.height; 
					fix_img_obj.height=max_height_int;
					fix_img_obj.width = (fix_img_obj.width  * (max_height_int/old_height));
			}
			
		}
	}
}