cash_img=new Image();

function preload_images (name,path,count,start)
{
 if(start) count+=start-1;
 i=(start)? start:1;

 for (; i<=count; i++) 
 {
  idx=name+i;
  cash_img[idx]= new Image();
	cash_img[idx].src = path+i+'.gif';
 
 
  on_idx='on_'+name+i;
  cash_img[on_idx]= new Image();
	cash_img[on_idx].src = path+i+'s.gif';
 }
}
preload_images('cmd','img/map/cmd_',4,2);