/*按比例生成缩略图*/
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;
      }
    }
  }
} 
//分类节点展开和折叠-------------------------------------------------------------------
function EndSortChange(a,b)
{
	if(eval(a).style.display=='')
	{
		eval(a).style.display='none';
		eval(b).className='SortEndFolderOpen';
	}
	else
	{
		eval(a).style.display='';
		eval(b).className='SortEndFolderClose';
		
	}
}
function SortChange(a,b)
{
	if(eval(a).style.display=='')
	{
		eval(a).style.display='none';
		eval(b).className='SortFolderOpen';
	}
	else
	{
		eval(a).style.display='';
		eval(b).className='SortFolderClose';
	}
}