//图片成比例缩放及滚轴改变图片大小
function resizing(ImgD,iwidth,iheight) 
	{
		 var image=new Image();
		 image.src=ImgD.src;
		 if(image.width>0 && image.height>0)
		 {
			if(image.width/image.height>= iwidth/iheight)
			{
			   if(image.width>iwidth)
			   {
				   ImgD.width=iwidth;
				   ImgD.height=(image.height*iwidth)/image.width;
			   }
			  	else
				{
				  ImgD.width=image.width;
				  ImgD.height=image.height;
				}
				   ImgD.alt=image.width+""+image.height;
			}
			else
			{
				if(image.height>iheight)
				{
				   ImgD.height=iheight;
				   ImgD.width=(image.width*iheight)/image.height;
				}
				else
				{
					ImgD.width=image.width;
					ImgD.height=image.height;
				}
				ImgD.alt=image.width+""+image.height;
			}
			
			ImgD.style.cursor= "pointer"; //改变鼠标指针
			ImgD.onclick = function() { //window.open(this.src);
		 } //点击打开大图片
	
	//if (navigator.userAgent.toLowerCase().indexOf("ie") > -1) //判断浏览器，如果是IE
	 //{  
	//	ImgD.title = "请使用鼠标滚轮缩放图片，点击图片可在新窗口打开";
		
	//	ImgD.onmousewheel = function img_zoom() //滚轮缩放
	//	 {
	//		var zoom = parseInt(this.style.zoom, 10) || 100;
	//		zoom += event.wheelDelta / 12;
	//		if (zoom> 0)this.style.zoom = zoom + "%";
	//		return false;
	// 	 }
	 // } 
	 // else //如果不是IE 
	//	  { 
			 ImgD.title = "";
	//	   }
	  }
}