//ͼƭ����������
var flag=false;
function drawimage(imgd,iwidth,iheight){
	//����(ͼƭ,����ŀ��,����ĸ߶�)
	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;
			}
		}
	}
}
//ͼƭ�������
  function changeimagesize(img) {
    if(img.height > 100 || img.width > 100){
      if(img.height >= img.width)
      {
        img.height=100;
      } else {
        img.width=100;
      }
    }
  }