[jQuery] [jquery form plugin] run function in success event

[orangdalam]

i wrote this code:
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function HidePreloader($idPreloader){
      $($idPreloader).hide();
   }
$("#formPassword").ajaxForm({
         target:'#container',
         clearForm:true,
         success: HidePreloader("#bluePreloader")
   });
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when it came to success event, the preloader image still there. did i
write it wrong ? it worked fine if the function has no passing argumen
like this:
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function HidePreloaderBlue(){
      $("#blue").hide();
   }
$("#formPassword").ajaxForm({
         target:'#container',
         clearForm:true,
         success: HidePreloaderBlue()
   });
-----------------------------------------------------------