function drawimage(mypic,w,h){
  var flag=false;
  var image=new image();
  image.src=mypic.src;
  if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= w/h){
      if(image.width>w){
        mypic.width=w;
        mypic.height=(image.height*w)/image.width;
      }
	  else{
        mypic.width=image.width;
        mypic.height=image.height;
      }
    }
    else{
      if(image.height>h){
        mypic.height=h;
        mypic.width=(image.width*h)/image.height;
      }
	  else{
        mypic.width=image.width;
        mypic.height=image.height;
      }
    }
  }
}