function isEmail(email){
        if (email=="") return true;
        reEmail=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/
        return reEmail.test(email);
    }
function checkID( id ) {
      tab = "ABCDEFGHJKLMNPQRSTUVXYWZIO"                     
      A1 = new Array (1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3 );
      A2 = new Array (0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5 );
      Mx = new Array (9,8,7,6,5,4,3,2,1,1);
    
      if ( id.length != 10 ) return false;
      i = tab.indexOf( id.charAt(0) );
      if ( i == -1 ) return false;
      sum = A1[i] + A2[i]*9;
    
      for ( i=1; i<10; i++ ) {
        v = parseInt( id.charAt(i) );
        if ( isNaN(v) ) return false;
        sum = sum + v * Mx[i];
      }
      if ( sum % 10 != 0 ) return false;
      return true;
}