function do_img_load_error(o,num)
{
   o.error=null;
   switch(num)
   {     
     case 1:
       //120*74
       o.src="/images/demo/120_74.jpg";
       break;
     case 2:
       o.src="/images/demo/96_70.jpg";
       break;
     case 3:
       o.src="/images/demo/114_84.jpg";
       break;
     case 4:
       o.src="/images/demo/120_74.jpg";
       break;
     case 5:
       o.src="/images/demo/68_68.jpg";
       break;
     default:
       o.src="/images/demo/120_90.jpg";
       break;   
   }   
}