var flag=false;
	function DrawImage(ImgD,iwidth,iheight){
	//参数(图片,允许的宽度,允许的高度)
	var image=new Image();
	image.src=ImgD.src;
	if(image.width>0 && image.height>0){
	flag=true;
	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;
	}
	}
	else{
	if(image.height>iheight){ 
	ImgD.height=iheight;
	ImgD.width=(image.width*iheight)/image.height; 
	}else{
	ImgD.width=image.width; 
	ImgD.height=image.height;
	}
	}
	}
	}  

	function DrawImage2(ImgD){ 
	 var image=new Image(); 
	 image.src=ImgD.src; 
	 if(image.width>0 && image.height>0){ 
	  flag=true; 
	  if(image.width/image.height>= 300/320){ 
	   if(image.width>300){
	    ImgD.width=300; 
	    ImgD.height=(image.height*300)/image.width; 
	   }else{ 
	    ImgD.width=image.width;
	    ImgD.height=image.height; 
	   } 
	   ImgD.alt="点击查看详细信息..."; 
	  } 
	  else{ 
	   if(image.height>320){
	    ImgD.height=320; 
	    ImgD.width=(image.width*320)/image.height; 
	   }else{ 
	    ImgD.width=image.width;
	    ImgD.height=image.height; 
	   } 
	   ImgD.alt="点击查看详细信息..."; 
	  } 
	 }
	}