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string compare problom ,help me

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47803124
157
47803124 2014.11.12 02:33 
 string a;
      if(a=="") Alert("ok");
if a equel empty, How do I write
Keith Watford
Moderator
9636
Keith Watford 2014.11.12 03:47  
You have not initialised the variable so the value is unknown
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